Lamp failure indicator (CB8384E)

This circuit indicates when a 28 V lamp burns, lighting a neon lamp with higher voltage. The circuit is from 1969 documentation.

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Cardiac Monitor (CB10961E)
This circuit was found in a 1987 magazine. It measures monitors the heartbeat through a...
3 MHz TTL Oscillator (CB5123E)
This crystal-controlled circuit was obtained from a 1980s documentation. The power supply should be 5...
Headphone Amplifier (CB14735E)
This circuit is from 1957 Raytheon documentation. The phone must be high impedance with 600 ohms...