Two-tube regenerative receiver (T1595E)

This circuit is from a Radio Electronics from 1949. The circuit is battery powered and has high impedance listening.

Giro Counter (CB19870E)
This circuit makes use of an integrated LM2907. The circuit is from an old documentation being...
Adjustable Bandpass Filter (CB24266E)
Using the 741 this circuit can be adjusted to values between 1 Hz and 100 kHz. The power supply...
1A Step-Up Converter (CB12947E)
The circuit shown in the figure uses the ST8R00 from ST Microelectronics which consists of a 1 A...