Schematics – Circuit Breakers!

REVISED Audio Output Transformer Amplifier Circuit Diagram

Hacked Cracklebox

CrackleboxSchematicFall2018_Final2

Please note: The 10 Ohm resistor coming off the 47uf cap on the top of the diagram should be a 100 Ohm resistor. I will fix the schematic as soon as I have time.

and this photo of the breadboarded circuit:

LM386-3 Pinout

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Atari Punk Console

http://www.instructables.com/file/FRC55EBGVVPD18L/?size=LARGE

Some notes about the above schematic:

Notice where the lines coming out of pins one and two cross the line coming from pin four. The line is curved at those points. This means it is NOT a connection. This happens on the other side of the diagram as well in several places.
Also notice the connection between pin 5 and pin 8. This connects the output of one of the 555 timers (there are two 555’s in one 556) to the “trigger” of the other 555.
Voltage (+) from your battery connects to pin 14.
The signal output in this 556 circuit comes from pin 9.
There are two potentiometers in this circuit (VR1 and VR2) that control frequency. The nose of the pot connects to voltage and one of the ears connects to the discharge pin (1 and 13) — it is the same on both sides of the circuit.
For this build you should use a 1/4″ female jack as the output (top right of the diagram) NOT the speaker output (bottom right).
If you are feeling wild, see below for ideas about how to add an on/off switch to your circuit, and /or how to add LEDs. It would be possible to add an LED to the signal output or as an on/off indicator. We will be talking more abou these components as we go along.

555/556 Pinout