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.
T This circuit activates a relay at the end of the time delay. The indicated relay is of the low...
This is the basic configuration for using a moving bar indicator or bargraph using the LM3914...
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...