Simple guitar amplifier?

Just curios, is it possible to build a (very) simple guitar amplifier out of  2x2N2222, a 8 Ohm speaker, a battery and some resistors?
Note: I have a guitar cable with another and cut off.

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MaracKoMarac (author) 5 years ago
Thank you all for your replies :-)
I changed my mind and decided to build a Fuzz Face.
I can buy all the parts in the local shop except for the 'Heavy Duty DPDT Stomp Switch'. Is there any alternative for it?
P.S. This is the layout:
First choice would be to go to All Electronics for their switch. It is by far the best deal out there.

Next would be to make your own with a microswitch, a bolt, a tube, a spring and some nuts. Fashion the hardware into a plunger and place over the switch. Adjust the nuts so that the head of the bolt reliably operates the switch without overstressing it. I don't recall the exact place I saw how to do this, but it might be at AMZ FX, GeoFex or ESP's site. Look around, or maybe you can see it in your mind already.

Good luck!
Actually, I found a better deal on the switches. Sparkfun has them for less than $2! I don't know how much shipping is, but if they have some of the parts you need, it might make it worth the wait.

As Rick Harris said, you'll need nore than just the bits you have, and you'll have a VERY low power amp at best. Playing around with some schematics from the web, tweaking them, I get about 30 mW with a 8 ohm speaker and about 50 mW with a 4 ohm speaker. Compare that with a simple LM386 amplifier at 250 mW into a 8 ohm speaker, and you can see why it is such a popular beginner chip.

Now, if you want to add some more capacitors and some diodes, a few more transistors (at least one as a PNP type - the 2n2222 is a NPN), then you can start thinking about a bit more wattage: 1-4 watts is possible with low supply voltage. Here are a few links to look at and possibly try on a breadboard: Electronics Express - figure 2, TechLibrary - multple, Rick Andersen. Please note that in some of these schematics, there are paralleled resitor capacitor pairs in the supply side of the preamp section that are meant to reduce the "high end" because the amps are meant for speech. To restore the high end, remove the capacitor in that pair.

Pick an amp and breadboard it. See if you like it. If not, try another. If you are frustrated and don't like any of them, try one of the LM386 guitar amps here on Instrucatbles.

Have fun!
rickharris5 years ago
Your going to need some capacitors and don't expect serious volume from 2 transistors or for that matter very good sound - although for a guitar that can be an advantage.

better use them to make a fuzz unit.