This amplifier, whose mounting on a printed circuit board was described in Radio Electronics of October 1960, has 35 W of power. The power supply uses a transformer and a set of 5 tubes.
The figure shows how to convert a rectangular signal into a triangular signal using an integrator. The...
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...
This circuit is from a very old publication, from the 60s. It uses germanium transistors from the...