Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be applied to an amplifier stage. Capacitors can be changed to change effects. img src="images/stories/bc/144064"

Two tone siren (CB9085E)

This circuit was found in a 1980’s Radio Electronics. The signal must be applied to an amplifier stage. Capacitors can be changed to change effects.

Logical optical driver (CB7300E)
We found this circuit in a Motorola documentation from 1968. Phototransistors are common and...
Temperature to Frequency Converter (CB4905E)
This circuit was found in an application note of the Linear Technology LTC1145. The circuit can be used...
Heterodyne Mixer (CB4291E)
This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the...

Two tone siren (﻿CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be applied to an amplifier stage. Capacitors can be changed to change effects. img src="images/stories/bc/144064"