3-tube receiver 2 (T1603E)

Using known tubes, this receiver was found in a Radio Electronics from 1949. The circuit does not include the power supply.

Conventional Astable (CB24839E)
This common circuit is from September 1984 Radio Electronics. The transistors are general purpose, and...
Digital Watch (CB17342E)
This circuit is from a 1979 publication, using displays of 7 segments of common cathode. The...
Fluid Flow Monitor (CB12461E)
This circuit is from a 1995 technical documentation. The transistor can be a BC558 and the sensor...