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Old 29th September 2003, 02:59 AM   #1
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Question Head-amp PS question

Hello,
I'm looking at building one of Prof. Leach's head-amps from the link below. Would there be any danger of damaging my MC cartridge if I ran the head-amp from a 9V regulated power source supplied by a wall-wart, instead of from a 9V battery????

Cheers,
Joseph.


http://users.ece.gatech.edu/~mleach/headamp/
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Old 29th September 2003, 04:19 AM   #2
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It'll work fine as long as you don't mind a lot of noise.
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Old 29th September 2003, 05:58 AM   #3
Electrons are yellow and more is better!
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When you have these one (or two) transistor solutions you must have a very very quite supply voltage. I can see only one problem (maybe) that the transformer introduce hum via capacitive coupling but it's no harm in testing.

EDIT: Oh I forgot, you probably add 1000-10000 uF in decoupling plus 100 nF after the wall-wart but add also 1-100 ohms in series. By this you create a LP-filter. It's possible the wall-wart deoesn't like to much caps at the output..
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Old 29th September 2003, 07:30 AM   #4
Electrons are yellow and more is better!
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Quote:
Originally posted by peranders
It's possible the wall-wart doesn't like to much caps at the output.
...therefore you must insert a resistor but the value is rather uncritical. Start with 100 ohms.
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Old 29th September 2003, 07:46 AM   #5
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When I have had a look at the schematics, you probably must have two resistors, because the battery is used as a totally floating voltage source. I'll doubt that you can make this circuit hum free but no harm in testing.
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Old 30th September 2003, 02:04 AM   #6
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Ok, Thanks for your help Peranders and SY. I'll make the head amp so it can be powered from either a battery or a wallwart-based regulated supply. That way the battery will work fine until (if ever) I get adequate results from the wall wart.

Cheers,
Joseph.
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