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Chip Amps Amplifiers based on integrated circuits

Chip amp power supply- a beginners guide
Chip amp power supply- a beginners guide
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Old 15th February 2017, 10:15 AM   #791
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
Are you able to measure the resistance of the two windings.
The low power winding may have a higher resistance. But both will be low and difficult to measure accurately.

Can you pass a known DC current through the two windings?
regards Andrew T.
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Old Yesterday, 05:55 PM   #792
jencelo is offline jencelo  United States
diyAudio Member
Join Date: May 2009
This is the board I purchased.

Yuan-Jing TA2022 2 x 180W Audio Power Amplifier Board

It says to use two windings 22-0-22 transformer but I will use one winding 20V transformer for each channel (dual transformers). Reason for being *20V is not to exceed the ideal 30V operating voltage. Each transformer will be 250VA. I was going to do 300VA each but read not to use 300VA unless I do soft start and use two on/off switches (one for each channel). 250VA for each channel should be plenty I think.

I may sound like I know what is what but this is all from reading and talking to people. I am definitely a beginner!

Am I on the right track?

* 20V x 1.414 - 0.7V (rectifier diode) + 10% (load)= 30V

22V gives me more than 30V which is not recommended when TA2022 is BTLed.

Don't know why they say to use a 22V transformer?
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