This step of two transistors has a high input impedance due to the use of FET. We can use BF245 for this function and the bipolar can be BC548. The circuit is from an 1975 American documentation.
This sophisticated drum sound synthesizer was featured in the May 1980 issue of Radio Electronics...
The curiosity of this circuit is in the way it was designed, as it was found in a 1967...
This circuit, found in similar versions in other articles in this section, dynamically tests...