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-   -   Power Amp Test Fixture (http://www.diyaudio.com/forums/equipment-tools/218978-power-amp-test-fixture.html)

WSJ 2nd September 2012 11:45 PM

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
http://farm9.staticflickr.com/8318/7...a3d15592_z.jpg

VOLTAGE REGULATOR 1
http://farm9.staticflickr.com/8310/7...1e8b4503_m.jpg

VOLTAGE REGULATOR 2
http://farm9.staticflickr.com/8458/7...05e2bb1f_m.jpg

MX 50 COM
http://farm9.staticflickr.com/8178/7...592f5c09_m.jpg

RIAA
http://farm9.staticflickr.com/8177/7...fd2bfc19_m.jpg

RCA 70
http://farm9.staticflickr.com/8032/7...2b149df8_m.jpg

OnAudio 4th September 2012 03:06 PM

Very nice.:D

yugal 4th September 2012 04:55 PM

thanks,WSJ.
please some more details.
yugal

WSJ 4th September 2012 07:53 PM

Dual power supply.

http://farm9.staticflickr.com/8321/7...4386c1f2_b.jpg

WSJ 16th September 2012 01:31 AM

5 Attachment(s)
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.

OnAudio 17th September 2012 06:41 AM

Thanks WSJ for the update ;)


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