This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a BC558 for the bipolar transistor. The circuit has 3 scales and a 10 M ohm input resistance.
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit generates sequence of pulses in order and times determined by the capacitors in pins...
We found this circuit in a 1979 French publication, but it can still be assembled today with...