Solar receiver (CB20487E)

This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the time. The circuit is from 1991.

15 V Regulator MA1539 (CB4017E)
This circuit is from a documentation on the MC1539 from Motorola and may, however, be implemented...
Light Alarm (CB483)
This circuit can be using in demonstration to teach how light sensor, such as the LDR, can be...
Pulse Generator (CB923E)
Thes astable was found in old publication of 1968. The circuit uses general purpose germanium...