Problem with low volume

Bill_F · December 22, 2003, 05:24:07 AM

Just built the Double D at Runoffgroove. I can hear the signal and as far as tone etc. goes it sounds OK. The bounce side is definitely hotter than the jiggle. The only problem is that the volume is REALLY low on both sides. I have to crank my amp up to hear anything at all.

Any ideas as to where to start searching for the problems?

Thanks in advance.
Bill

Ansil · December 22, 2003, 05:42:12 AM

jfet pinouts and volages

Bill_F · December 22, 2003, 05:51:34 AM

Quote from: Ansiljfet pinouts and volages

Hi Ansil. I've checked the Jfet pinouts over and over and they are correct. I'll take some voltage readings later and post them.

Bill_F · December 22, 2003, 06:19:44 AM

Edited - I made a mistake on these voltages because the battery was to low. Will post again in awhile.

Ge_Whiz · December 22, 2003, 01:08:05 PM

Try a fresh battery to make it louder?

Bill_F · December 22, 2003, 01:24:59 PM

Quote from: Ge_WhizTry a fresh battery to make it louder?

Yeah, I think that's what the problem was. :oops: I forgot to disconnect the battery overnight. This circuit just ate that battery up! Definitely one for a wall-wart.

So I've got the volume back, but I'm not that happy with the sound. It's nothing like the sound clip over at Runoffgroove. It's a bit to sizzly (the only word I can think to describe it). Will putting it in a box remove any of that?

B Tremblay · December 22, 2003, 02:06:23 PM

Yes, the power consumption of the Double D is quite high.

Are both channels exhibiting the unwanted "sizzle" at all Gain settings? How else does the sound differ from the clips?

An enclosure may solve the problems, but I never had much noise when it was on the breadboard.

Gringo · December 22, 2003, 04:33:05 PM

I suppose you have tweaked the trimpot to get 4.5 or whatever voltage sounds better for you in the input jfet.

If for sizzle you mean too much treble, i doubled the output cap(2 0.22 in parallel with a switch for the "fat" and "stock" sound) and it sounds a lot better, the low gain channel is not so ear-piercing now (i love that "rumble"!!).

Had to add a pulldown res at the output to kill switching pops, too. Also added a wallwart jack with a diode, the batteries just don't cut it for long with this baby.

Keep searching, i'm sure you'll make it work

Bill_F · January 01, 2004, 07:25:05 PM

Just wanted to say a quick thanks to all who responded here. I haven't had a chance to get back to this but will post some results when I do.

Thanks again,
Bill

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Problem with low volume

Ansil