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Thanks for "godfreyl" and "ALERTLINKS" suggestion first.
I follow the method they provided to modify the circuit a little bit.
Finally it work perfect without any problem!!!
Thanks again!!!
I study the circuit again.
I found that the output terminal of this circuit is using positive (+) with the output signal, not like other normal audio device using Ground (-) with the output signal.
So, how can I convert a positive (+) output signal to Ground (-) output signal ????
Can someone...
Hello!
Please take a look on the following picture first.
Recently I had build 2 of this amp circuit for my family's PC as a headphone amp.
This little amp work OK when connected to headphone.
After that I have an idea is that I want to use the amp headphone jack output as a line out to...
Transformer Problem
Hello, I have some question about transformer.
I have a transformer that is 220VAC input, 12VAC output, 12VA...
My questions are:
1. What is 12VA meaning?
2. How can I know the max. current of this transformer?
3. If I swap the input & output.......therefore it will become...
step up voltage circuit
Hello!
I have looking for a "low DC to high DC" voltage step up circuit long long time.
Fortunately, I found my "Cooler Master Musketeer III" Tube Headphone/Pre amp have this voltage step up design on the circuit board.
And I draw the whole diagram of this circuit...
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