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Step 3Make the amplifier circuit and wire for power
The circuit is very similar to the Make crackerbox amp, the little gem from Run Off Groove and about a million others. I don't remember what bassis I used for this or if it was the datasheet.
I just used a Radio Shack PCB for this project because i had it laying around and there were so few parts it was easy to lay out on this board to use the traces. This reduced the amount of point to point wiring and soldering that had to be done.
The solar panels push higher than 9VDC, highest I saw was 11VDC, in direct sun but since the 386 can handle higher voltage than that I didn't feel the need for a regulator.
The diode is in the circuit just to stop some of the back feed from the caps
the 2 2200uf caps are used as a battery with infinite recharge cycles. I figured why use batteries if you don't need them? This amp is intended for outside daytime use.
I added a volume knob later because it was just so loud when I ran an ipod through it. I attached the potentiometer input pin to the input signal before the .1uf cap going to IC pin 2, the wiper to the cap and the third pin to ground.
Perfboard layout done with Inkscape and the Perfboard template came from Run Off Groove Templates. Red dashed lines are for runs on the underside.
I just used a Radio Shack PCB for this project because i had it laying around and there were so few parts it was easy to lay out on this board to use the traces. This reduced the amount of point to point wiring and soldering that had to be done.
The solar panels push higher than 9VDC, highest I saw was 11VDC, in direct sun but since the 386 can handle higher voltage than that I didn't feel the need for a regulator.
The diode is in the circuit just to stop some of the back feed from the caps
the 2 2200uf caps are used as a battery with infinite recharge cycles. I figured why use batteries if you don't need them? This amp is intended for outside daytime use.
I added a volume knob later because it was just so loud when I ran an ipod through it. I attached the potentiometer input pin to the input signal before the .1uf cap going to IC pin 2, the wiper to the cap and the third pin to ground.
Perfboard layout done with Inkscape and the Perfboard template came from Run Off Groove Templates. Red dashed lines are for runs on the underside.
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