Digital Power Supply Outputs

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Springset68

Joined Sep 29, 2018
2
I am currently looking for a replacement power supply for an older model of electronic keyboard (piano). The 15vdc power supply for the amplifier PCB has deteriorated beyond repair and I am left with either scratch building a new one or finding a replacement with the same outputs. The power supply has a basic IC regulated +15 -15v dual output and also a single -20v output. In simple terms, what would the -20v be used for in this case?

Any input would be appreciated.

Thanks
 

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BR-549

Joined Sep 22, 2013
4,928
There are several options.......time, money and your preference will decide. If you want to try to stay original.....one could have a new board made. If it's not too complex.....you might be able to make one.

Or just replace with off the self supplies.
 

ScottWang

Joined Aug 23, 2012
7,397
If the copper foil is bad but not too serious then it still can be fix by wiring, when the old power supply damaged and it could happen at the capacitors and the regulator IC, so if you want to fix it by yourself then you can change the capacitor one by one from the parts of big filter, why you need to change them one by one, because it can be found where is the real problem is, if your multimeter with ESR function in C range then you can desolder the capacitor one by one and measure it, if the values of ESR far from the values that it should be then just change it -- The ESR of capacitor.

If you want to buy then you can buy two of the below products and a two sets of 15Vac-0V-15Vac transformer, if you can't buy two sets then you can buy two of the 15Vac-0V-15Vac transformers.
+15V/-15V 1A AC/DC Regulator Power Dual Supply Input 15-18V.
 
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