Source for LASER (CB7843E)

This power supply for gas laser (HeNe) was found in a 90’s Popular Electronics. It generates from 1300 to 1500 V using common components.

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Telephone Monitor (CB12655E)
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
FET Transconductance Meter (CB3932E)
This interesting FET-tester circuit was obtained from an old American documentation. The bipolar...
TV Booster (CB23771E)
This old VHF TV booster that also serves FM was found in Radio Electronics magazine from April...