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MPF102

Started by 23, August 26, 2010, 07:03:26 PM

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23

I got my gate and source mixed up on my noisy cricket, wired it like a BCE (2n blah blah blah tranny) I can hear my guitar but theres oscillation in the back ground. read about connecting pin 3 and 6 on the Lm386, does that really work? Used a 2n3906 to get what little sound I have now, the tone affects the pitch of oscillation and the volume, volume and the gain increases its intensity over the guitar sound and the grit switch in one position is really bad and in the other not too bad at all but still there. I built this for a friend and feel like a *&^*&^ now that it doesnt work.............

any help appreciate it, sands
put it together, now take it apart

zambo

I always here oscilation from lm386. Try the better quality chip that dano mentions on beavis audio research sight. Also the 100mf cap from + to - on the dc input helps a ton! Use a 7809 voltage regulator as well. Everything else I dont realy know. Its been awhile since I messed with those but I gave up on them for that reason. Vellman has a really cool 3 watt amp that runs on 9v as a kit and its a screamer. Pre amp it with any distortion pedal and use level knob for the master volume. Surprisingly nice for what they are. You can get them for like 12 bucks on ebay and put together in 30 minutes tops. I run one with a valvecaster as a preamp and it sounds pretty sweet. Good luck!
I wonder what happens if I .......

23

thanks for the reply but are you referring to the 220uf electro to ground from the DC input.....
put it together, now take it apart

23

got it..............I built a big daddy that works great, so I decided to pull the LM386 from it and the damn Cricket still oscillates like crazy, so I put it back in the big daddy and work perfect. Ive traced this thing and its built right and I built the circuit big enough that theres no bridges, still I scraped between some points with an awl to make sure they were clean. any suggestions?
put it together, now take it apart

zambo

I built bigdaddy and it worked great as well. Never got a noisey cricket to work right. Got a little smokey to work right. I think i used the input buffer from another 386 amp though. The little gem at runoff groove. I think i used the input buffer off the little gem and thats what helped the lil smokey.
I wonder what happens if I .......

23

I believe I'm gonna try the ruby and add in the grit switch from the cricket. Im still trying stuff and the thing just isnt going to work right.
put it together, now take it apart