Featured in the February 1949 Radio Electronics magazine, this benchtop instrument generates multi-range audio signals. The circuit has 6 tubes including the rectifier.
This circuit was obtained in an old magazine from the 1970s. The circuit can still be assembled with...
This power oscillator uses an LM380 amplifier. We found it in old English documentation. The C3...
In the figure we show a simple way to use a zener diode to protect a load against overvoltage. The...