Gas ignition (CB7075E)

This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a gas lamp of the time.

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Ramp and Hold Circuit (CB14217E)
The circuit whose characteristics are given in the graph uses two transconductance operational amplifiers...
kHz Crystal Oscillator (100)
This circuit was found in the Radio Electronics magazine in an article about emitter-coupled...
Temperature Sensor (CB6022E)
This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon...