Top Positive Review for Power Supply Module on Banggood USA|Shopping USA

48% OFF 0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit US$4.99 US$9.59 View It

Overall:

pborut 14/10/2015

Very lovely, school grade design, simple to assemble, fine operation, bought two of them. However, technical specification for max voltage should be lower. When I connected it to 24V AC transformer one operational amplifier burnt practically immediately. After reviewing schematics, it was quickly clear. Op amp TL081 is specified at +-18V max power supply (36V). In this design, power supply voltage for two out of three op amps is 39V, vhen connected to 24V AC transformer. (-5V + sqrt(2)*24V ). It should use different configuration for op amp supply or op amps with higher voltage (ex. OPA604A). Latter was my solution, since I have pair of 24V transformers. But as I said, lovely little kit.

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Michaelo I was aware with the voltage issue having read about it on several forums but opted to buy an use an 18V AC transformer (giving me about 24 volts). Nice to have the alternative opamps... might change to these...
Reply 14/01/2016

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