Summary of Contents for A and T Labs K6
- Page 1 AUDIO POWER AMPLIFIER ASSEMBLY MANUAL A and T Labs Inc P.O. Box 4884 Wheaton, IL 60187 Tel: 630-668-7870 Fax: 630-668-7870 Web: www.a-and-t-labs.com Technical Support: support@a-and-t-labs.com...
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Page 2: Table Of Contents
3.4 POWER SUPPLY FLANGE MOUNTED COMPONENTS.............13 4. TESTING............................13 4.1 INVERTER TESTING........................13 4.2 ALTERNATIVE INVERTER TESTING CHECKLIST (If an oscilloscope is available) ....14 4.3 AMPLIFIER TESTING........................15 5. FINAL ASSEMBLY ..........................16 6. OPERATING HINTS..........................17 © 2001 A and T Labs Inc. AMK6a... -
Page 3: Introduction
The K6 switching power supply runs at 75 KHz, allowing the filter capacitors to be much smaller, providing much less stored energy to dissipate in case of a short circuit. At the same time, the supply is capable of providing over 1 KW of continuous power and 2 KW peak to drive the most demanding audio loads. - Page 4 +/- 30 Volts, while the output stage supply voltage may vary from +/- 41 volts to +/-82 volts, as determined by the switching power supply setting. D11 and D12 regulate the +/- 15 volts for the operational amplifiers IC3 and IC4. © 2001 A and T Labs Inc. AMK6a...
- Page 5 Power Supply AC Input +15 V Bridging Amplifier Bridging Right Output Channel Clipping Direct Input Power Output Level Amplifier Output Protection DC/OT LED Differential Input Differential Input Amplifier Figure 1 – Block Diagram © 2001 A and T Labs Inc. AMK6a...
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Page 6: Inverter Power Supply
Several features, such as bridging capability, are also optional. Variable board populations associated with these will be pointed out during construction. The options are summarized in the following table: © 2001 A and T Labs Inc. AMK6a... - Page 7 (section 5) noise of a fan is unacceptable. The 3 ½” unit with fans may be best suited for sound re- enforcement or home theatre applications. © 2001 A and T Labs Inc. AMK6a...
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Page 8: Amplifier Boards
7 – Violet 8 – Grey 9 – White Example: 46.5K, 1/4W, 1% - Yellow-Blue-Yellow-Red (space) Brown It’s always a good idea to check the value of each resistor with an ohmmeter before installing! © 2001 A and T Labs Inc. AMK6a... - Page 9 Red-blk-grn-brn Brn-blk-blk-brn Red-blk-blk-blk 5.11K Grn-brn-brn-brn Red-blk-blk-blk Brn-blk-blk-brn Red-blk-blk-blk Red-blk-blk-red Red-blk-blk-blk 330, 3W See Note 1 Red-blk-blk-blk Brn-blk-blk-blk Red-blk-blk-blk 330, 3W See note 1 Red-blk-blk-blk Brn-blk-blk-blk Red-blk-blk-blk Brn-blk-blk-brn 1.21K Brn-red-brn-brn Blu-grey-brn-brn 27.4K Red-viol-yel-red © 2001 A and T Labs Inc. AMK6a...
- Page 10 1N4728A 1N4744A 1N4002 1N4728A 1N4740A 1N4002 1N4742A 1N4742A 1N4742A Next, install small signal transistors and ICs. Adjust R18 to its approximate middle position. Note: Q24 will be installed later, in section 4.3. © 2001 A and T Labs Inc. AMK6a...
- Page 11 23) will be mounted after preliminary testing is completed. 3.1.5 Miscellaneous parts ü ü ü ü ü ü Part Part Part Fuse clips (4) LED1 Twisted pair ** Term. Blocks (5) LED2 Coax #1 © 2001 A and T Labs Inc. AMK6a...
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Page 12: Inverter Power Supply
4.99K Yel-wht-wht-brn Brn-blk-blk-brn Or-brn-blu-blk 2.05K Red-blk-grn-brn 1K, .5W Brn-blk-blk-brn Brn-blk-blk-red Brn-blk-blk-brn Brn-blk-blk-red 22K 10W Brn-blk-blk-brn Note: R13 is mounted with a pair of short segments of wire soldered to the resistor tabs. © 2001 A and T Labs Inc. AMK6a... - Page 13 Term. Blocks(10) 350uH LED1 Red Voltage select Switch 1.8UH x 2 LED2 Green Wire for T3 ZNR1 ERZ-V20D431 .25 amp fuse 15 amp fuse 8 amp fuse Jumpers 1-4 Bridge rectifier Bridge rectifier © 2001 A and T Labs Inc. AMK6a...
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Page 14: Heat Sinks And Mechanical Assembly
At this time, prepare the mechanical assembly of heat sink components, drilling the flanges and heat sinks. Mechanical Assembly Prepare mechanical assembly © 2001 A and T Labs Inc. AMK6a... -
Page 15: Power Supply Flange Mounted Components
10 Watt resistor per rail. Set switch SW2 to the 41 volt position, and apply power. Check for +/- 41 (+/- 2) volts at the inverter output. Switch SW2 to +/- 58 volts and +/- 82 volts (+/- 2), and check for each voltage at the output. © 2001 A and T Labs Inc. AMK6a... -
Page 16: Alternative Inverter Testing Checklist (If An Oscilloscope Is Available)
If you have trouble with these last tests, for example if the shutdown LED operates (which will typically be in the form of a pulsating cycle with the LED operating, and © 2001 A and T Labs Inc. AMK6a... -
Page 17: Amplifier Testing
Q14 and Q15. Since the amplifier is open loop at this point, the drive signals will easily overload, and look like square waves, about 12 volts p-p or less, as limited by D7 and D8. © 2001 A and T Labs Inc. AMK6a... -
Page 18: Final Assembly
LEDs, inputs, outputs, power cord, etc. in the appropriate places. For the 3 ½” unit this includes proper alignment between the front panel LED holes and the LEDs, as mounted on the amplifier boards. © 2001 A and T Labs Inc. AMK6a... -
Page 19: Operating Hints
100 watts into an 8 ohm load. For that kind of operation, choose the 58 volt setting. Second, when driving low impedance speakers, such as 1-4 ohms, the power dissipation in the amplifier may be limited by setting the voltage to 41 volts. In © 2001 A and T Labs Inc. AMK6a... - Page 20 See section 4.3) Finally, remember the power levels this amplifier is capable of, and be careful with both your speakers and your ears. Happy listening! © 2001 A and T Labs Inc. AMK6a...
- Page 38 Inv Amp Item Value Part Number Supplier Amp x 2(L and R) 10uf 50V EF1106 DigiKey 150pf 1402PH DigiKey 100uf 50v P5182 DigiKey 100uf 50v P5182 DigiKey .1uf P4525 DigiKey 150pf 1402PH DigiKey 82pf P4848 DigiKey .22uf P4667 DigiKey .22uf P4667 DigiKey 10uf 50v...
- Page 39 LF357N 22998 Jameco LM358 120862 Jameco T90N5D12-12 145752 Jameco LED1 Orange 156937 Jameco LED2 152784 Jameco LED3 Green 156929 Jameco MPSA06 26462 Jameco MPSA06 26462 Jameco MPSA56 MPSA56 DigiKey MPSA56 MPSA56 DigiKey MPSA56 MPSA56 DigiKey MPSA06 26462 Jameco MPSA56 MPSA56 DigiKey MPSA06 26462...
- Page 40 10K pot 594-64W103 Mouser 5.11K 5.11KXBK DigiKey 1.00KXBK DigiKey 1.00KXBK DigiKey 5.11K 5.11KXBK DigiKey 1.00KXBK DigiKey 20.0KXBK DigiKey 330, 3W P330W-3BK DigiKey 100XBK DigiKey 330, 3W P330W-3BK DigiKey 100XBK DigiKey 1.00KXBK DigiKey 681XBK DigiKey 681XBK DigiKey 1.00KXBK DigiKey 2K, 5W VC5E2.0K DigiKey 2K, 5W...
- Page 41 27.4K 27.4KXBK DigiKey 1.21K 1.21KXBK DigiKey 27.4K 27.4KXBK DigiKey 46.4K 46.4KXBK DigiKey 46.4K 46.4KXBK DigiKey 46.4K 46.4KXBK DigiKey 46.4K 46.4KXBK DigiKey 46.4K 46.4KXBK DigiKey 5.11K 5.11KXBK DigiKey 200XBK DigiKey 200XBK DigiKey REG1 LM317T LM317T DigiKey REG2 LM337T LM337T DigiKey 80 deg. C Airpax 67F080 Sager Input Jack...
- Page 42 .01uf P4513 DigiKey 10uf 50V P5178 DigiKey 4700pf P4422 DigiKey 4700pf P4422 DigiKey 4700pf P4422 DigiKey 4700pf P4422 DigiKey 560pf, 1000V P4125 DigiKey 470UF 100V P5850 DigiKey 470UF 100V P5850 DigiKey 470UF 100V P5850 DigiKey 470UF 100V P5850 DigiKey .01UF P4513 DigiKey .22uf...
- Page 43 LED2 Green 156929 Jameco MOV1 ERZ-V20D431 P7277-ND DigiKey IRF450IR-ND DigiKey IRF450IR-ND DigiKey IRF450IR-ND DigiKey IRF450IR-ND DigiKey VN0610LL ZVN4210A-ND DigiKey 316XBK DigiKey 7.50K 7.50KXBK DigiKey 10.0KXBK DigiKey 4.7, .5W 4.7H DigiKey 75.0XBK DigiKey 75.0XBK DigiKey 75.0XBK DigiKey 75.0XBK DigiKey 75.0XBK DigiKey 75.0XBK DigiKey 75.0XBK...
- Page 44 REG1 NJM7812FA-ND DigiKey REG2 NJM7812FA-ND DigiKey 15 A, 120 V 15 A, 120 V CK 7201P3YZQE 26358 Jameco MT3137-ND DigiKey GATE DRIVE T-QSE1 D1871 Coilcraft ETD49 T-QSE2 KC022L-ND DigiKey Term. Blocks(10) ED1601-ND DigiKey Insulators (4) BER178 DigiKey Fuse clips (6) F041 DigiKey ATL1995.2...