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 was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads....
This circuit turns a relay on or off by touching the sensors or by connecting sensors at these...
This article is from the Italian magazine Sperimentare number 11 of 1975. It can be assembled with...