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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
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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?
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Old 19th June 2018, 05:55 PM   #792
jencelo is offline jencelo  United States
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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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Old 21st June 2018, 06:45 PM   #793
Puffin is offline Puffin  United Kingdom
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Location: U.K
The Tripath datasheet says the following :-

Power Supplies
The TA2022 requires the split supply rails.

The TA2022 can operate over a wide range of power supply voltages from +/-12V to +/-36V.

As I understand it Tripath went under many years ago. Whether there are still any NOS chips around I don't know. The board you have bought may have cloned chips on it.

The Yuan-Jing board connections for the power supply could confuse some into thinking that they need 2 transformers. The board requires a centre tapped transformer (3 wires) and only the centre tap (one wire) will go to grd. If you look at the customer photo gallery on the link you sent you will see that the transformer used there has only 3 wires and only one grd pcb connector has been used.
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Old 22nd June 2018, 12:07 AM   #794
jencelo is offline jencelo  United States
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I had no idea they were cloning Tripath. I know they are long gone but I have heard there are still NOS available.

No, I meant I want to use two transformers. I think dual transformer will make a difference. At least it does make a difference in my TP60 TA2022 amp or I think dual transformers are the reason for separation of the instruments like I have never heard before from any amp.

Last edited by jencelo; 22nd June 2018 at 12:09 AM.
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Old 22nd June 2018, 05:01 AM   #795
Puffin is offline Puffin  United Kingdom
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Location: U.K
If you want to use two transformers then I think you would have to modify the board. There are two bridge rectifiers and (without having seen a schematic) I would suspect that they are linked and to use two transformers would mean that you would have to cut some tracks.

Are Tripath chips sill being manufactured?

Last edited by Puffin; 22nd June 2018 at 05:08 AM.
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Old 22nd June 2018, 05:15 AM   #796
jencelo is offline jencelo  United States
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You threw me off there!

Why would using one transformer with two secondary windings would be different than using two dual transformers each having one secondary winding?
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Old 22nd June 2018, 11:15 AM   #797
Puffin is offline Puffin  United Kingdom
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I think you need to read some stuff about single power supplies and split rail supplies and then apply this to the board you have.
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Old 25th June 2018, 08:45 AM   #798
zane1978 is offline zane1978
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Join Date: May 2018
I finally finished selecting components at mouser for my dual mono 20W amplifier: Cornell Dubilier PP-capacitors, Nichicon KZ EL-capacitors & 2 toroidal's 50VA. I think I can finally start designing 2 powersupplies (same design) that fits my dual mono amplifierbuild perfectly.

1. My first question is which circuitdesign is most optimal for a dual mono lm3886tf amplifier and why;
2. My second question is how I can calculate all the components and capacitors and how many capacitors are most optimal for my my dual mono amplifier? After reading on your website that 10.000uF capacitors can flatten midbass and other stuff like that, I assumed this small sentence was important regarding soundquality. I want an efficient/optimal powersupply design, does anyone here have a link or information, that helps me to determine which powersupply-design is best for a standard mono lm3886 amplifier & how many capacitors and which sizes are most optimal?

For anyone reading and/or helping me get started on designing my psu's, thanks!
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Old 25th June 2018, 01:00 PM   #799
zane1978 is offline zane1978
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Join Date: May 2018
I can not edit my post so this is part 2 of my post so I can explain why I am confused:

circuitsbasics 20w*2 lm3886tf amplifier guide
: Stereo amplifier, 250VA toroidal i.c.w. 8200 uF*4 capacitors (they do not explain why they pick 8200uF)
neurochrome power86 : 3300uF * 2 (if i remember correctly).
neurochrome toroidal calculation : 100VA (instead of 250VA by circuitbasics)

The designmethod-difference and outcome is quite huge, I believe this could be under in the influence of using the crestfactor-method (or not). Hopefully I can even go lower capicitance then the power-86, because i will have only 1 channel per psu.

Normally I can find similar methods on the internet, but now i have carlosfm-psu on decdun-blog with 2x10.000 uF and I do not know why. I have a circuitbasics which has 4x8200uF and I can not seem to find why they use that capicitance. And neurochrome only has 2x3300uF (iirc) and I can not find out why without buying the psu.


Hopefully you guys and girls understand that I find this confusingand am looking for guidance.
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Old 26th June 2018, 10:04 AM   #800
zane1978 is offline zane1978
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Join Date: May 2018
Challenge solved, I found general information about how large the capacitance-reservoir should be on instructables. Now I understand why more reservoir should always be better (more capacitance means a smaller ripple). Still, diy audio is quite challenging if you are not electronically gifted or schooled, but I will get there.


My apologies for littering my incompetence in this topic.
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