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Stanford Research Systems DS335 User Manual

Synthesized function generator
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MODEL DS335
Synthesized Function Generator
1290-D Reamwood Avenue
Sunnyvale, California 94089
Phone: (408) 744-9040 • Fax: (408) 744-9049
email: info@thinkSRS.com • www.thinkSRS.com
Copyright © 1993, 2002, 2013 by SRS, Inc.
All Rights Reserved.
Revision 1.7 (11/2013)

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  • Page 1 MODEL DS335 Synthesized Function Generator 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 • Fax: (408) 744-9049 email: info@thinkSRS.com • www.thinkSRS.com Copyright © 1993, 2002, 2013 by SRS, Inc. All Rights Reserved. Revision 1.7 (11/2013)
  • Page 2 DS335 Synthesized Function Generator...

  • Page 3: Table Of Contents

    Introduction 4-15 GPIB Communication Calibration Enable 4-15 RS-232 Communication Calbytes 4-15 Data Window Necessary Equipment 4-19 Command Syntax Adjustments 4-19 Detailed Command List Output Amplifier Bandwidth 4-19 Function Output Commands Bessel Filter Adjustment 4-20 Sweep Control DS335 Synthesized Function Generator...
  • Page 4 SYNC Generator Power Supply and Cable Function Selection GPIB and RS232 Interfaces Output Amplifier Output Attenuator Front Panel Component Placement Option Board Main PC Board Component Placement Power Supplies Option Board Component Placement GPIB and RS232 Interfaces DS335 Synthesized Function Generator...
  • Page 5 LINE FUSE LINE VOLTAGE SELECTION Verify that the correct line fuse is installed before The DS335 operates from a 100V, 120V, 220V, or connecting the line cord. For 100V/120V, use a 240V nominal ac power source having a line 1/2 Amp slow blow fuse and for 220V/240V, use a frequency of 50 or 60 Hz.

  • Page 6: Srs Symbols

    SRS Symbols DS335 Synthesized Function Generator...

  • Page 7: Specifications

    Ramp 100 mV 5.77V 0.03Vrms Noise 100 mV 3.24V 0.02Vrms Resolution 3 digits Accuracy (with 0V DC Offset), 50Ω Ω Ω Ω terminated Sine: Accuracy ± 0.1 dB Square: Accuracy ± 2% Triangle, Ramp: Accuracy ±2% DS335 Synthesized Function Generator...
  • Page 8 Internal rate or External control, phase continuous Waveform: Sine, Square, Triangle, Ramp Rate: 0.01 Hz to 50 kHz (internal) 1 µHz to 3.1 MHz (10 kHz for triangle or ramp) Shift Span: External: TTL input, 1MHz maximum DS335 Synthesized Function Generator...
  • Page 9 RS232-C (300 to 9600 Baud, DCE) and GPIB. All instrument functions can be controlled over the interfaces. Weight 8 lbs. Dimensions 8.5" x 3.5" x 13" (W x H x L) Power 25 Watts, 100/120/220/240 Vac 50/60 Hz DS335 Synthesized Function Generator...
  • Page 10 Specifications DS335 Synthesized Function Generator...

  • Page 11: Abridged Command List

    Sets/reads the serial poll enable register. *STB? {j} Reads the serial poll register, or just bit n of register. STAT? {j} Reads the DDS status register, or just bit n of register. DENA(?) j Sets/reads the DDS status enable register. DS335 Synthesized Function Generator...
  • Page 12 Trig'd set on sweep trigger Not in use Not in use Not in use Warmup set when the DS335 is warmed up Test Error set when self test fails Not in use mem err set on power up memory error...

  • Page 13: Getting Started

    Getting Started Getting Started Introduction This section is designed to familiarize you with the operation of the DS335 Synthesized Function Generator. The DS335 is a powerful, flexible generator capable of producing both continuous and swept waveforms of exceptional purity and resolution. The DS335 is also relatively simple to use, and the following examples will lead you step-by-step through some typical uses.
  • Page 14 7) Press [UP ARROW] three times. We've changed the output frequency to 10.0301 kHz. Frequency Sweep The next example demonstrates a linear frequency sweep. The DS335 can sweep the output frequency of any function over the entire range of allowable output frequencies.

  • Page 15: Introduction To Dds

    The frequency resolution is equal to the resolution with which the Phase Increment can be set. In the DS335, the phase registers are 48 bits long, resulting in an impressive 1:10 frequency resolution. The ASIC also contains a modulation control CPU that operates on the Phase Accumulator, Phase Increment, and external circuitry to allow digital synthesis and control of waveform sweeps.
  • Page 16 PLL designs. DS335 Description Figure 2: DS335 Block Diagram A block diagram of the DS335 is shown in Figure 2. The heart of the DS335 is a 10 MHz crystal clock. The 10 MHz clock controls the DDS ASIC, waveform ROM, and high-speed 12bit DAC.
  • Page 17 SYNC OUTPUT and, in the case of square waves, to the amplifier input. Generating square waves by discriminating the sine wave signal produces a square wave output with rise and fall times much faster than allowed by either of the signal filters. DS335 Synthesized Function Generator...
  • Page 18 Introduction DS335 Synthesized Function Generator...

  • Page 19: Front Panel Features

    Features Front Panel Features 1) Power Switch The power switch turns the DS335 on and off. The DS335 has a battery backed up system RAM that remembers all instrument settings. 2) Data Entry Keys The numeric keypad allows for direct entry of the DS335's parameters. To change a parameter value simply type the new value.
  • Page 20 ±40V relative to earth ground. 9) Status LEDs These four LEDs indicate the DS335's status. They are: name function REMOTE The DS335 is in GPIB remote state. The [3] key returns local control. GPIB Flashes on GPIB activity. RS232 Flashes on RS232 activity.

  • Page 21: Rear Panel Features

    Rear Panel Features 1) Power Entry Module This contains the DS335's fuse and line voltage selector. Use a 1 amp slow blow fuse for 100/120 volt operation, and a 1/2 amp fuse for 220/240 volt operation. To set the line voltage selector for the correct line voltage, first remove the fuse.
  • Page 22 Features DS335 Synthesized Function Generator...

  • Page 23: Function Setting

    Power-On When the power is first applied to the DS335 the unit will display its serial number and ROM version for about three seconds. Then, the DS335 will initiate a series of self-tests of the circuitry and stored data. The test should take about three seconds and end with the message "TST PASS".

  • Page 24: Frequency

    3.5 MHz White Noise (fixed) Frequency is usually displayed by the DS335 with the highest resolution possible. However, if the frequency is below 100 Hz, the DS335 will display the frequency with 1 µHz resolution. At frequencies greater than 1 MHz the digits below 0.1 Hz cannot be displayed, but the frequency still has 1 µHz...

  • Page 25: Dc Offset

    Entering a negative amplitude inverts the ramp output. D.C. Only The output of the DS335 may be set to a DC level by entering an amplitude of 0 V. When the amplitude is set to zero the A.C. waveform will be completely shut off and the DS335 may be used as a DC voltage source.
  • Page 26 2-12 Function Setting DS335 Synthesized Function Generator...

  • Page 27: Sweeps/Fsk

    For BI directional sweeps the DS335 sweeps from the start to the stop frequency, then sweeps from the stop frequency to the start frequency, and repeats. If the DS335 is set for a single sweep, the sweep occurs only once.

  • Page 28: Sweep Frequencies

    The FSK input accepts TTL level signals. When enabled (FSK mode with 0 Hz rate), it is sampled at a 10 MHz frequency by the DS335. A low TTL level selects the start frequency, and a high TTL level selects the stop frequency (see example below).
  • Page 29 Sweeps & FSK 2-15 External Frequency-Shift Keying (FSK) Example DS335 Synthesized Function Generator...
  • Page 30 2-16 Sweeps & FSK DS335 Synthesized Function Generator...

  • Page 31: Instrument Setup

    GPIB Address Storing Setups To store the DS335's current setup press [SHIFT][7] followed by a location number in the range 0 - 9. After pressing any UNITS key to enter the location number, the message "sto done" will be displayed, indicating that the settings have been stored.

  • Page 32: Self-Test

    LED will light. The GPIB LED will go off after the host computer does a serial poll of the DS335. Note: the user service request is in addition to the usual service requests based on status conditions (see PROGRAMMING section for details).

  • Page 33: Programming The Ds335

    0 and 30. The default address is 22. RS232 Communications The DS335 is configured as a DCE (transmit on pin 3, receive on pin 2) and supports CTS/DTR hardware handshaking. The CTS signal (pin 5) is an output indicating that the DS335 is ready, while the DTR signal (pin 20) is an input that is used to control the DS335's transmitting.

  • Page 34: Detailed Command List

    Device Clear universal command. The present value of a particular parameter may be determined by querying the DS335 for its value. A query is formed by appending a question mark "?" to the command mnemonic and omitting the desired parameter from the command.

  • Page 35: Function Output Commands

    INVT (?) i The INVT command turns output inversion on (i=1) and off (i=0). The INVT? query returns the current inversion status. This function is used with the ramp waveform to set it for positive or negative slope. DS335 Synthesized Function Generator...
  • Page 36 "FSEN1" command. If the rate has been set to 0Hz and FSK selected, the command "FSEN1" would enable the FSK BNC input on the rear panel. This TTL signal is sampled at a 10MHz rate and toggles between the Start frequency and the Stop frequency. DS335 Synthesized Function Generator...
  • Page 37 Enables sweeps on (i=1) or off (i=0). If the continuous sweep is selected, enabling sweeps will start the sweep with the specified rate. If triggered single sweep is selected and sweeps are enabled then the DS335 waits for a front panel trigger or a *TRG command to start the sweep.

  • Page 38: Setup Control Commands

    0 to 9. If the stored setting is corrupt or has never been stored an execution error will be generated. *RST The *RST common command resets the DS335 to its default configurations. *SAV i The *SAV command saves the current instrument settings as setting number Status Reporting Commands (See tables at the end of the Programming section for Status Byte definitions.)

  • Page 39: Test And Calibration Commands

    Incorrect use of some of these commands can destroy the calibration of the DS335. $CLK? The $CLK? command queries the DS335 for the status of its calibration jumper. Shown below are the different status values that the DS335 can return:...

  • Page 40: Status Byte Definitions

    DDS status byte. On power on the DS335 may either clear all of its status enable registers or maintain them in the state they were in on power down. The action taken is set by the *PSC command and allows things such as SRQ on power up.
  • Page 41 The Warmup bit will be set and remain set after the warmup period has expired. The rest of the bits in this register are set when the corresponding event occurs and remain set until cleared by reading this status byte or by the *CLS command. DS335 Synthesized Function Generator...
  • Page 42 3-10 Programming Commands DS335 Synthesized Function Generator...
  • Page 43 To successfully interface the DS335 to a PC via the GPIB interface, the instrument, interface card, and interface drivers must all be configured properly. To configure the DS335, the GPIB address must be set in the GPIB menu. The default GPIB address is 22; use this address unless a conflict occurs with other instruments in your system.
  • Page 44 Programming Examples EXAMPLE 1: GPIB COMMUNICATION. C LANGUAGE This program communicates with the DS335 via GPIB . The program is written in C. C Program to demonstrate communication with the DS335 via GPIB. Written in Microsoft C and uses National Instruments GPIB card.

  • Page 45: Programming Examples

    3-13 EXAMPLE 2: RS232 COMMUNICATION. BASIC LANGUAGE BASIC Program to demonstrate communication with the DS335 via RS232. Program assumes the RS232 option is enabled (use [SHIFT] [2]) and the BAUD rate is set to 9600. 10 OPEN "com2:9600,n,8,2,cs,ds,cd" FOR RANDOM AS #1 'Set up com2' 20 PRINT #1, "...
  • Page 46 3-14 Programming Examples DS335 Synthesized Function Generator...

  • Page 47: Troubleshooting

    Off Error DC output offset outside of ±5V range (into 50Ω). Out q err Output queue error. The DS335 output queue is full due to too many queries that have not been read back. Range Er Parameter in command is out of allowed range for that command.

  • Page 48: Self-Test Error Messages

    GPIB address is 22, and so it is a good idea to use this address when writing programs for the DS335. Any address from 0 to 30 may be set in the GPIB menu. To check the GPIB address, press [SHIFT][1] twice to view the GPIB address.
  • Page 49 Troubleshooting rate is 9600 baud. The DS335 always sends two stop bits, 8 data bits, and no parity, and will correctly receive data sent with either one or two stop bits. When connecting to a PC, use a standard PC serial cable, not a "null- modem"...
  • Page 50 Troubleshooting DS335 Synthesized Function Generator...

  • Page 51: Performance Tests

    Performance Tests PERFORMANCE TESTS INTRODUCTION The procedures in this section test the performance of the DS335. The first set tests the basic functionality of the DS335 from the front panel. The second set of tests actually measures the DS335's specifications.

  • Page 52: Functional Tests

    Performance Tests FUNCTIONAL TESTS These simple tests verify that the DS335's circuitry is functional. They are not intended to verify the DS335's specifications. Front Panel Test This test verifies the functionality of the front panel digits, LED's, and buttons. 1) Turn on the DS335 while holding down [FREQ]. Press the [UP ARROW] and a single segment of the leftmost digit should light.

  • Page 53: Amplitude Flatness

    1) Connect the DS335's output to the oscilloscope input and terminate in 50Ω. 2) Set the DS335 to sine wave, 10Vpp, and 50Ω Load Impedance. Set to linear sweep with a Unidirectional waveform. Set the start frequency to 1Hz, stop frequency to 3MHz, and the rate to 100Hz. Turn the DS335's sweep ON.

  • Page 54: Performance Tests

    These tests are intended to measure the DS335's conformance to its published specifications. The test results may be recorded on the test sheet at the end of this section. Allow the DS335 at least 1/2 hour to warm up, run the DS335's self test procedure, and proceed with the tests.

  • Page 55: Dc Offset Accuracy

    7mV DC. Allow the DS335 at least 1/2 hour to warm up. 2) Set the DS335 to sine wave, 1 kHz, 3.00 Vrms, and 50Ω Load Impedance. Allow the thermal converter 15 seconds to stabilize and record the result as the 1kHz reference value.

  • Page 56: Subharmonics

    1) Connect the DS335 to the RF spectrum analyzer. Set the DS335 to sine wave,(10Vpp), 0V offset, and 50Ω Load Impedance. 2) Set the DS335 to 102 kHz. Set the spectrum analyzer to 51 kHz center frequency, 10 kHz span. The carrier amplitude at 51 kHz should be less than -70 dBc.

  • Page 57: Harmonic Distortion

    DS335 to 50 kHz. Verify that the harmonics are at least -60 dBc. 5) Set the DS335 to 500 kHz, and 3 MHz, and verify that all harmonics are at least -50 dBc, and -40 dBc, respectively. Record the results.
  • Page 58 3) Set the time interval counter to measure the negative width of the A input. This reading should be equal to the reading in step 2 < ±13 ns. Record the result. THIS COMPLETES THE PERFORMANCE TESTS DS335 Synthesized Function Generator...
  • Page 59 Performance Tests 4-13 DS335 PERFORMANCE TEST RECORD Serial Number: __________ Date:____________ Tested By:______________ Comments: Pass Fail Functional Tests Front Panel Test _____ _____ Self Test (at power up) _____ _____ Sine Wave _____ _____ Square Wave _____ _____ Amplitude Flatness...

  • Page 60: Square Wave Symmetry

    1 MHz, 10 Vpp. Overshoots ___________ ±200 mV Square Wave Symmetry square, 1 MHz, 5 Vpp. + pulse width ___________ square, 1 MHz, 5 Vpp. - pulse width ___________ asymmetry = (+ width) - (- width) ___________ 13 ns DS335 Synthesized Function Generator...

  • Page 61: Calibration

    Recalibration of the DS335 involves determining the values of the calbytes and storing the new values in RAM. The calbyte values at the time of the DS335's production are also stored in ROM and may be recalled at any time.
  • Page 62 +/- 5% from nominal value of 5205. HI_24dB +/- 5% from nominal value of 4135. HI_26dB +/- 5% from nominal value of 3284. HI_28dB +/- 5% from nominal value of 2609. HI_30dB +/- 5% from nominal value of 2072. DS335 Synthesized Function Generator...
  • Page 63 SQ_0 Fixed at 2^15 (32,768). The dc reference level. SQ_1 For 19,531 to 39,062 Hz. +/-10% from nominal. SQ_2 For 39,063 to 58,593 Hz. +/-10% from nominal. SQ_159 For 3105468 to 3125000 Hz. +/-10% from nominal. DS335 Synthesized Function Generator...
  • Page 64 0 to 4095. Nominal 2048. For dc to 19530 Hz. SYM_1 0 to 4095. Nominal 2048. For 19,531 to 39,062 Hz. SYM_2 0 to 4095. Nominal 2048. For 39,063 to 58,593 Hz. SYM_159 0 to 4095. Nominal 2048. For 3105468 to 3125000 Hz. DS335 Synthesized Function Generator...

  • Page 65: Necessary Equipment

    All of the adjustments are on the bottom PCB. Use an insulated adjusting screwdriver. 1) Connect the output of the DS335 to the oscilloscope with a 50W terminator. Set the DS335 to square wave, 8 Vpp, 100 Hz. Set the scope to 2 V/div vertical and 5 ms/div horizontal.

  • Page 66: Bessel Filter Adjustment

    Bessel Filter Adjustment This adjustment sets the bandpass of the DS335's Bessel waveform filter. 1) Set the DS335 to RAMP waveform, 8 Vpp, 10 kHz frequency. Connect the DS335's output to an oscilloscope with a 50W terminator. Set the DS335 for 50Ω Load Impedance. Set the scope to 2 V/div vertical and 200 ns/div horizontal.

  • Page 67: Circuit Description

    DAC. For the DDS to work well, it is imperative that this clock be kept clean: hence the oscillator is operated from a separate supply (+5_CLOCK) and its output is passed directly to the waveform DAC. The 10 MHz is buffered to provide clocks to the rest of the system. DS335 Synthesized Function Generator...
  • Page 68 LED_STROBE latch. The circuit pumps charge onto C200 with every output to the LED_STROBE latch. C200 is discharged by R229 if the port strobes cease, removing the output enable from the 74HC374 display drivers. DS335 Synthesized Function Generator...

  • Page 69: System Dac And S/H's

    DDS ASIC (DS335M4) Waveforms are generated in the DS335 by updating a 12 bit DAC at a rate of 10 million samples per second. The waveform (sine, ramp, saw, or noise) is stored in ROM, and the ROM is addressed by a 'phase accumulator' which is implemented in a CMOS ASIC.
  • Page 70 There is a 74HC273 (U413) that is also loaded as if it were an ASIC register; its output goes directly to the SWEEP/FSK rear panel BNC. When the DS335 is performing a sweep, this output provides a pulse that is synchronous with the sweep rate.

  • Page 71: Pre-Attenuator

    (U605, a CA3140) maintains a voltage across the emitter resistor which is proportional to (SW_AMPL + 5.00Vdc). As SW_AMPL varies from -5 to +5V, the constant current source varies from 0 to 11 mA, generating from 0 to 1.1 Vpp square wave output. DS335 Synthesized Function Generator...

  • Page 72: Function Selection

    DAC. The total attenuation is 30 dB, or a factor of 0.0316, which will reduce the 7.94 Vpp level from the output amplifier to 0.25 Vpp. For ac levels below this, the pre-attenuator will be used (Sheet FG6) to provide up to 14 dB additional attenuation (for levels down to 50 mVpp). DS335 Synthesized Function Generator...

  • Page 73: Power Supplies

    49h is shifted into the command shift register (U1000), and the command strobe asserted, then register 01 in the GPIB controller will be read into the shift register (U1002). The contents of the data shift register may then be clocked down to the CPU with eight IN and eight shift instructions. DS335 Synthesized Function Generator...
  • Page 74 Circuitry DS335 Synthesized Function Generator...

  • Page 75: Component Parts List

    DS335 Component Parts List Power Supply Parts List REF. SRS PART VALUE DESCRIPTION C 955 5-00201-526 2200U Capacitor, Electrolytic, 35V, 20%, Rad C 956 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 957 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX...

  • Page 76: Front Panel

    5-10 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION U 1009 3-00217-340 MAX232 Integrated Circuit (Thru-hole Pkg) 0-00299-000 1/8" ADHES TAPE Hardware, Misc. 1-00048-171 14 COND Cable Assembly, Ribbon Front Panel and Main PC Board Parts List REF. SRS PART...
  • Page 77 DS335 Component Parts List 5-11 REF. SRS PART VALUE DESCRIPTION C 537 5-00268-532 270P Capacitor, Ceramic Disc, 50V, 10% NPO C 538 5-00275-532 120P Capacitor, Ceramic Disc, 50V, 10% NPO C 539 5-00151-501 680P Capacitor, Ceramic Disc, 50V, 10%, SL...
  • Page 78 5-12 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION C 828 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 829 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 830 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX...
  • Page 79 DS335 Component Parts List 5-13 REF. SRS PART VALUE DESCRIPTION D 24 3-00455-310 GREEN COATED LED, Coated Rectangular D 25 3-00455-310 GREEN COATED LED, Coated Rectangular D 26 3-00884-306 LED, Rectangular D 27 3-00004-301 1N4148 Diode D 28 3-00004-301 1N4148...
  • Page 80 5-14 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION Q 103 3-00026-325 2N5210 Transistor, TO-92 Package Q 104 3-00026-325 2N5210 Transistor, TO-92 Package Q 200 3-00022-325 2N3906 Transistor, TO-92 Package Q 201 3-00022-325 2N3906 Transistor, TO-92 Package Q 202...
  • Page 81 DS335 Component Parts List 5-15 REF. SRS PART VALUE DESCRIPTION R 500 4-00138-407 10.0K Resistor, Metal Film, 1/8W, 1%, 50PPM R 501 4-00141-407 Resistor, Metal Film, 1/8W, 1%, 50PPM R 502 4-00141-407 Resistor, Metal Film, 1/8W, 1%, 50PPM R 503...
  • Page 82 5-16 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION R 653 4-00777-407 11.5 Resistor, Metal Film, 1/8W, 1%, 50PPM R 654 4-00777-407 11.5 Resistor, Metal Film, 1/8W, 1%, 50PPM R 655 4-00777-407 11.5 Resistor, Metal Film, 1/8W, 1%, 50PPM...
  • Page 83 DS335 Component Parts List 5-17 REF. SRS PART VALUE DESCRIPTION R 751 4-00056-401 Resistor, Carbon Film, 1/4W, 5% R 752 4-00056-401 Resistor, Carbon Film, 1/4W, 5% R 800 4-00749-439 Resistor, Metal Film, 1/4W, 1%, 50ppm R 801 4-00749-439 Resistor, Metal Film, 1/4W, 1%, 50ppm...
  • Page 84 5-18 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION U 103 3-00045-340 74HC32 Integrated Circuit (Thru-hole Pkg) U 106 3-00491-340 UPD71054C Integrated Circuit (Thru-hole Pkg) U 107 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg) U 108 3-00158-340 74HC154N Integrated Circuit (Thru-hole Pkg)
  • Page 85 DS335 Component Parts List 5-19 REF. SRS PART VALUE DESCRIPTION U 809 3-00141-329 LM337T Voltage Reg., TO-220 (TAB) Package U 810 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package U 811 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package U 812 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package...
  • Page 86 5-20 DS335 Component Parts List REF. SRS PART VALUE DESCRIPTION 0-00204-000 REAR FOOT Hardware, Misc. 0-00248-026 10-32X3/8TRUSSP Screw, Black, All Types 0-00315-021 6-32X7/16 PP Screw, Panhead Phillips 0-00326-026 8-32X1/4PP Screw, Black, All Types 0-00396-000 BE CU / DDS Hardware, Misc.

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