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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Electroscope (CB497)
Static charges in objects Dan be detected by this sensitive electroscope. The meter indicates when the...
Simple audio oscillator (CB8097E)
Found in Popular Electronics from the 90s, this circuit generates a 1 kHz signal. The coil is from an...
Missing pulse detector (CB7547E)
Using a 555, this configuration appears elsewhere on this site. This is from American...