| Electronics > Beginners |
| Can I power this 6V preamp from 12V? |
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| ELS122:
So I found this preamp circuit on google and it says that it needs a +6 and -6v PSU, Can I power it whit + and -12v cause the amp I’m trying to design needs a hell of a lot of power and a computer PSU is the only powerful enough thing I have. And it has a +12 v and -12v outputs. So can I power it whit that? And yes I know that you can make a virtual ground from resistors and capacitor and yes it would probably work since the only ground in this circuit is for the input and output. The problem is that my amp probably wouldn’t work whit it then because it would share the 12v rail So can I somehow make it work? |
| Paul Moir:
If you're using a computer power supply, simply use a pair of linear regulators (LM7806 and LM7906) to reduce the voltages from 12 to 6V. This will help give you some isolation from the noise of the computer power supply, which you are probably going to need lots of. In particular, the -12V rail tends to be pretty nastily regulated since it's seldom used at all. |
| AVGresponding:
Also carefully check the specs on the current output of the -12v rail, it's probably quite small, less than half an amp. That may not be sufficient to your needs. EDIT: Taking a close look at your circuit, it doesn't use a ground rail, so you're fine to use a 12vdc supply. Since the main decoupling cap is only 470uF, the whole thing probably uses only a couple of hundred milliamps or so. Best way to find out is to build it and see! |
| Gyro:
No, that is a simple single supply pre-amp with AC coupled input and output. The supply voltage markings are deceptive, it only requires a single +6V supply. The line marked 6V- is ground, both for the supply and for the input and output. It was almost certainly intended to be battery powered (possibly explaining the markings as in '6V battery +ve and -ve terminals'). P.S. Can you please edit the thread title in your OP to be less clickbait - Something like Transistor preamplifier supply, that might help others in the future. |
| Gyro:
--- Quote from: ELS122 on October 13, 2019, 08:51:10 pm ---So I built a different circuit that works but when I turn it to max volume it start pulsing DC and burning my tiny test speaker. What could be the problem here? Also the PSU is rated 0.5amps for the -12v rail but it’s a cheap one so I bet it is only like .3amps. And I don’t think it’s clickbait because it IS what I’m asking: would this work. More clickbait title would be; PLZ HELP FAST NEED HELP NOW!!!!! --- End quote --- So you built a different circuit to the one you posted and asked about and now expect us to tell you guess why your tiny test speaker is burning? Maybe its tiny heart is broken? Anyway I think life is probably too short to care. ::) Maybe clickbait was the wrong word (although yours seems just as bad), but other people seem to manage to think of a sensible topic related titles when they expect help from others! Yours conveys no meaning. >:( |
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