Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Summary of Contents for Whistle rock audio ML12
- Page 1 ML12 D ISCRETE M IC P RE PCB M ANUAL www.whistlerockaudio.com ...
-
Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ................................ 3 Foreword .................................. 3 Disclaimer .................................. 3 BILL O F M ATERIALS .............................. 4 CHOOSING T HE T RANSFORMERS .......................... 6 ... -
Page 3: Introduction
AWAY from children and animals. Finally, always take necessary precautions when handling potentially dangerous tools such as cutters, scissors and soldering iron. ML12 P CB M ANUAL Page | 3 ... -
Page 4: Bill Of Materials
Relay Back EMF Suppress 100V 0.3A Fairchild 1N4148 1N4148 Relay Back EMF Suppress 100V 0.3A Fairchild 1N4148 1N4148 Relay Back EMF Suppress 100V 0.3A Fairchild 1N4148 ML12 P CB M ANUAL Page | 4 ... - Page 5 2 conn wire terminal (F) housing Molex 22-01-2027 HS-5PIN 5 conn wire terminal (F) housing Molex 22-01-2057 Crimp Terminals Gold contact crimp terminals Molex 08-55-0102 ML12 P CB M ANUAL Page | 5 ...
-
Page 6: Choosing The Transformers
Cleaner Sounding – 50% Nickel/50% Steel Core, Split Bifilar Ed Anderson EA2503 Vintage Sounding – AP2503 Replica, Quadfilar Classic API Ed Anderson EA2623 Vintage Sounding – AP2623 Replica, Trifilar Classic API ML12 P CB M ANUAL Page | 6 ... -
Page 7: Component Layout
COMPONENT LAYOUT Here is your reference map to the ML12 PCB. You may refer to it whenever necessary. ML12 P CB M ANUAL Page | 7 ... -
Page 8: Pcb Stuffing Order
Finally, you can stuff and solder more parts at once! ML12 P CB M ANUAL Page | 8 ... -
Page 9: Assembly Tips
RESISTORS - Resistors are not polarized but make sure that you check each value with a digital multimeter before soldering them on. You can avoid many headaches with a bit of prevention. ML12 P CB M ANUAL ... -
Page 10: Installing The Doa (Discrete Op--Amp) Sockets
Note that the hole on the DOA footprint labeled ‘NC’ does not require any socket, as it is not connected to any part of the circuit. You may skip it! ML12 P CB M ANUAL Page | 1 0 ... -
Page 11: Installing The Relays
5. The relay should now be secured in place by the two opposite leads that were soldered (Figure 6). You can now let go of the PCB and solder/touch up all the leads. ML12 P CB M ANUAL ... -
Page 12: Installing The Headers
JMP1: I nput T X r atio s etting. JMP2: D OA D C b lock d efeat. ML12 P CB M ANUAL ... -
Page 13: Installing The Gain Potentiometer
Front s upport b rackets s oldered. Bottom o f t he p ot m ust b e f lat a gainst t he P CB. ML12 P CB M ANUAL ... -
Page 14: Installing The Push Buttons
Keep f ingers c lear o f t he l ugs w hile s oldering! ML12 P CB M ANUAL Page | 1 4 ... -
Page 15: Installing The Input Transformer
Match t his t ransformer l ead… …to t his h ole. Slide out the card strip when you’re done and keep it somewhere safe for your next ML12 build! J ML12 P CB M ANUAL ... -
Page 16: Installing The Output Transformer
Trim the transformer lead to the appropriate length before soldering but don’t trim them too short! About two inches is a good length to start with. ML12 P CB M ANUAL Page | 1 6 ... -
Page 17: Hooking Up The Leds
Slide the LEDs in the panel holes when mounting the completed preamp in a case. The rigidity of the assembly will keep the LEDs in place. ML12 P CB M ANUAL Page | 1 7 ... -
Page 18: Before P Owering U
Series w ired p rimaries J MP1 s etting. Experiment with both settings as they can give your preamp perceivably different tones, especially with dynamic microphones. ML12 P CB M ANUAL Page | 1 8 ... -
Page 19: Setting Up Jmp2
Almost all bipolar input DOAs will have a large DC offset (sometimes more than 1V) when a high impedance signal is presented to their input. For instance, the ML12.DI1 is an optional DI module for the ML12; when activated, it feeds the connected instrument signal to the positive input of the op-amp. -
Page 20: Making The Connections
MAKING THE CONNECTIONS The connections to the ML12 module are fairly straightforward. Below are a series of diagrams that should help with the wiring. POWER C ONNECTION The header connection J1, labeled ‘POWER’, is where all power supply voltages need to be connected. - Page 21 If you are using the optional ML12.DI modules, they simply connect to the header labeled ‘DI’ (J2) on the ML12 PCB. PIN 1 of the header is marked with a dot next to it. This is the case on the DI module header as well.
- Page 22 PIN 1 of both XLR jacks should be connected together using thick gauge wire (16AWG or larger) and tied to the systems star ground. The ML12 PSU provides a convenient connection point for this purpose. ML12 P CB M ANUAL ...
-
Page 23: Voltage Check And Smoke Check
V+ points). Make sure that JMP2 is not installed. (You may install it later. See page 19 for details.) Install your DOA of choice on the ML12. You may have to press firmly down to seat the pins completely. Turn on the PSU and wait 30 seconds. -
Page 24: Final Test
Last modified on September 3 , 2015. All the information within this document and the PCB layout of the ML12 discussed herein are the intellectual property of Whistle Rock Audio. No copying or distribution of this manual in part or in full is allowed without my prior consent.
Need help?
Do you have a question about the ML12 and is the answer not in the manual?
Questions and answers