This amplifier was found in a 1970s documentation. Darlington transistors can be replaced for modern equivalents of at least 80 V x 2 A, equipped with good heat sinks.
The integrated circuit 4136 consists of operational amplifiers of type 741 in the same enclosure and...
In the figure we have an active high pass filter of 100 Hz, suggested by National Semiconductor in its 1994...
According to the consulted American publication of the 1980s, a zener diode can be used for DC...