...for soldering practice and for fun (I'm weird). It works OK. It's loud and it's a little buzzy (boo) but it does make noise so I did *something* right
Based on an insanely simple LM386-and-a-single-big-cap circuit I found on Google somewhere. Only real mod I made was to add a 100nF (MLCC "104") cap at the power input.
Here's where the parts came from...
Speaker was from an old PC. IIRC it was an IBM NetVista. (Nobody cares.)
Big cap came out of the remains of the printer that put my mother through lawschool. (That Canon BJ100 was an awesome little printer.)
The LM386 power amp chip was left over from another project. (Specifically, it is an LM386N-1; not sure of the manufacturer -- logo is two horizontal lightning bolts.)
Power jack came out of a cheapass battery fan from Wal*Mart.
Vol control (with built-in switch) came from some stuff a friend (not local, but not on [H]) sent me. 10kOhm, audio taper.
Had the DIP socket, tiny cap, and headphone jack from various other past stuff.
Perfboard was purchased from Radio Shack a while back. The other half I have a project for as well -- but that one won't happen for a while yet...
Wires came out of a Sanyo Betamax player (or, rather, the remnants thereof) that was The Official Betamax Player Of The 1984 Olympics. LOL.
I'm using it with a deplorably random 9v 1a wall wart that is almost certainly unregulated.
Links to larger images...
http://i.imgur.com/t3ffLOw.jpg
http://i.imgur.com/xNBCFuu.jpg
http://i.imgur.com/mgE5m08.jpg
Here's pics...
Completed circuit, after soldering...
Added tape for wire-strain relief...
...and here's the plans I had drawn up last night on how I wanted to do it. (Protip: turn your head to the left -- I did not rotate this one and I should have.)
Based on an insanely simple LM386-and-a-single-big-cap circuit I found on Google somewhere. Only real mod I made was to add a 100nF (MLCC "104") cap at the power input.
Here's where the parts came from...
Speaker was from an old PC. IIRC it was an IBM NetVista. (Nobody cares.)
Big cap came out of the remains of the printer that put my mother through lawschool. (That Canon BJ100 was an awesome little printer.)
The LM386 power amp chip was left over from another project. (Specifically, it is an LM386N-1; not sure of the manufacturer -- logo is two horizontal lightning bolts.)
Power jack came out of a cheapass battery fan from Wal*Mart.
Vol control (with built-in switch) came from some stuff a friend (not local, but not on [H]) sent me. 10kOhm, audio taper.
Had the DIP socket, tiny cap, and headphone jack from various other past stuff.
Perfboard was purchased from Radio Shack a while back. The other half I have a project for as well -- but that one won't happen for a while yet...
Wires came out of a Sanyo Betamax player (or, rather, the remnants thereof) that was The Official Betamax Player Of The 1984 Olympics. LOL.
I'm using it with a deplorably random 9v 1a wall wart that is almost certainly unregulated.
Links to larger images...
http://i.imgur.com/t3ffLOw.jpg
http://i.imgur.com/xNBCFuu.jpg
http://i.imgur.com/mgE5m08.jpg
Here's pics...
Completed circuit, after soldering...
Added tape for wire-strain relief...
...and here's the plans I had drawn up last night on how I wanted to do it. (Protip: turn your head to the left -- I did not rotate this one and I should have.)