Heart Monitor –Transmitter (CB25406E)

This circuit was found in a Radio Electronics magazine from November 1991. The circuit operates at 2.2 MHz and has a low impedance output.

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100 MHz Emitter Follower Oscillator (CB5119E)
We found this circuit in a 1980s American publication from Motorola. Modern equivalent transistors...
Digital Potentiometer (CB12291E)
This digital potentiometer is from a 1993 publication, but it can be easily assembled today. R1 to...
Instrumentation Amplifier (CB14777E)
This circuit with germanium transistors is from 1960 and was found in Mullard's transistor...