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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Time Relay (CB12432E)
This simple timer is from a 1998 publication. Other operational amplifiers can be used, and the...
Carbon Microphone Preamplifier (CB12905E)
This very old circuit, from a publication from the 1970s, uses a germanium transistor and two...
500 to 500 kHz Wobbulator (CB13846E)
This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or...