This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This circuit uses a large surface diode to detect radiation (alpha and beta particles, in addition to...
This preamplifier for the phonographic capsule was obtained in an Argentine publication from 1973....
This circuit is from a 1993 publication and can be implemented with any optical isolator that has...