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Old 2nd September 2012, 10:45 PM   #1
WSJ is offline WSJ  United States
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Default Power Amp Test Fixture

The power amp test fixture can be used to test power amplifier, voltage regulator and preamp boards. It has a chimney heat sink to accommodate up to 8 power transistors and two 44-pin edge card connectors. The test boards are mounted on a standard Vector board with the 44-pin edge card configuration. I have designed several regulators, RIAA equalizer amps and power amps using the 44-pin edge card configuration.

The power supply is designed to provide +/- 22V and +/- 44V. The next upgrade will include voltage regulators with adjustable voltage, adjustable current limit and current monitor. Speaker and RCA connectors will also be added.

FIXTURE SIDE
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VOLTAGE REGULATOR 1
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VOLTAGE REGULATOR 2
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MX 50 COM
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RIAA
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RCA 70
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Last edited by WSJ; 2nd September 2012 at 11:15 PM.
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Old 4th September 2012, 02:06 PM   #2
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Very nice.
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Old 4th September 2012, 03:55 PM   #3
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thanks,WSJ.
please some more details.
yugal
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Old 4th September 2012, 06:53 PM   #4
WSJ is offline WSJ  United States
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Dual power supply.

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Old 16th September 2012, 12:31 AM   #5
WSJ is offline WSJ  United States
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The test fixture regulators are designed to allow adjustable voltage and current limit to protect the amp during initial testing. Once the amp is working, it can be connected to the power supply caps.

The power supply regulators are designed to allow the current limit to be adjusted form a few milliamps to several amps. The voltage range is 7 to 40 V with an input voltage of 45 V. The same circuit will be used for both +V and V regulators with different components. The wire wrap plug board was built with DIP sockets to allow the parts to be replaced with different values and testing of both +V and V regulators.

The scope pic shows the load transient recovery time and level, the current was switched form 150 mA to 1.15 A. C1 was removed for the test.
Attached Images
File Type: jpg MVC-012S.JPG (58.5 KB, 24 views)
File Type: jpg MVC-014S.JPG (54.9 KB, 21 views)
File Type: jpg REGULATOR COMMON BASE REV 3 JPG.JPG (132.3 KB, 36 views)
File Type: jpg MVC-013S.JPG (66.8 KB, 35 views)
File Type: jpg MVC-015S.JPG (54.2 KB, 25 views)
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Old 17th September 2012, 05:41 AM   #6
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Thanks WSJ for the update
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