Comment

Comment by GARAGE HERMIT on March 28, 2020 at 5:12am

BrianQ, made this recently,

just a simple lm386, used a 12" fane speaker and an old draw as a cab, only control is a gain pot,

Comment by Paul Craig on March 25, 2020 at 10:24am

How about making 2 of these in a cabinet with 2 speakers for a stereo amp like the old Crate amps back in the day?

Comment by BrianQ. on March 24, 2020 at 4:34pm

Being shut in is a perfect time to build an amp! 

Comment by BrianQ. on May 16, 2019 at 5:58pm

Pretty simple, straightforward LM386 based amp, all 9 volt versions of the opamp will work, try the 12 volt version for more headroom & clarity, but beware the 9 volt version will doesn’t like 12 volts....... will also drive a speaker cab just like the Smokey! Enjoy :)

Comment by Paul Craig on November 21, 2018 at 12:10pm

Yeah the Ruby is based on the Lil' Gem amp and the Ruby can use a 4ohm or 8ohm speaker(4ohm sounds a bit louder, but it pushes the chip more). The big difference between the 2 amp circuits is the JFET filter in the input circuit. The Ruby shows a MPF102 JFET, but you can use a 2N5457 JFET instead. Just depends on which one you like better.

I also use a 3-way toggle switch on/off/on in the input circuit with 2 different value caps(.047 & .1) so I can get darker tones with guitar or play bass with the .1 cap. The off center just acts as a kill switch/no signal.

Comment by BrianQ. on November 19, 2018 at 6:18am

Use 8 ohm speaker

Comment by Paul Craig on November 3, 2018 at 5:35am

I haven't had email in a week so I missed this. When it comes to the 386 chip, I prefer the Ruby Amp because of the input filters and interactive volume and gain pots.

Then I got to playing around with another build and added a tone circuit. Then I added a second chip and bridged them for a 2watt amp that you could say is just a distortion box op-amp.

Comment by BrianQ. on October 24, 2018 at 6:53pm

Just regurgitating something I posted some years ago,maybe wake up this group 

Comment by Paul Craig on August 24, 2018 at 2:21am

I've got a Tube amp in need of a re-cap and another that needs to be rebuilt and converted into a guitar/bass amp from a turntable amp, but I haven't stopped guitar projects long enough to do them yet. Hopefully I can start on them soon. 

Comment by BrianQ. on August 23, 2018 at 8:21am

Anybody make any amps lately? Anybody build em from scratch?

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