Safer SID

Project: Protection circuit for SID
Target : C64
Time   : 20 min
Cost   : ~1 US$
Use    : Protect the SID from overvoltage.

Summary

See figure below.

Details

The SID cannot take more than 3V_pp or 1Veff, respectively. Therefore, if you use the SID audio input, the input voltage should be limited. The circuit below limits the input signal to about 1.4V_pp. This is done by two antiparallel silicon diodes which cut off the signal at +/- 0.7V. The resistor limits the current coming out of the audio source.

Ingredients

1 resistor 470ohm
2 diodes 1N4148 (or 1N914)

Instructions

Build the following circuit:
(Click here for ASCII version)
... and stuff it in a DIN plug for the AV jack.

Possible failures

Are you KIDDING?

Updated: September 30th, 1997
Created: February 3rd, 1997
Status : NOT VERIFIED!