Electronic Relay (CB14743E)

This assembly is from 1957 from a Raytheon manual, but can be modernized using a BC548, 6 V power supply and common 100 mA relays.

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Preamplifier for 30 MHz (CB10057E)
This low noise preamplifier has a gain of 19 dB in the 30 MHz band. The circuit is from the 80s....
Optical direction discriminator (CB8079E)
Found in American documentation from the 90s, this configuration detects the direction of rotation...
Linear Ramp Generator (CB11227E)
This circuit generates a 5.3 kHz linear ramp with the indicated components. The 7555 is the CMOS...