NE602 Crystal Oscillator (CB26005E)

This oscillator reaches 50 MHz with an overtone crystal. The circuit is from Electronics Now magazine from February 1997.

Dip Meter with Tunnel Diode (CB23881E)
This is the circuit for the HM-10ª, an instrument sold by Heathkit. The circuit is from a Radio...
Undervoltage Indicator (CB4988E)
This circuit indicates when the monitored voltage drops below the value determined by the divider...
CMOS Drive for Low Level Activation (CB13778E)
This circuit, from a 1975 Motorola manual, uses a power Darlington transistor of the time. We can...