LM3600 Ring Modulator (CB25147E)

This circuit is a four-quadrant multiplier using an LM3900. The circuit was found in the July 1988 Radio Electronics magazine.

| Clique na imagem para ampliar |

Simple MW Radio (CB4359E)
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
Silk Screen Printing Timer (CB4652E)
If the reader still uses silk screen printing tables this is an interesting circuit found in a 1994...
Alarm with NC sensors (CB25724E)
This alarm circuit with sensors in series was found in the Electronics Now magazine of June 1994....