This simple unijunction and bipolar generator appeared in Radio Electronics magazine in September 1865. It generates signals from 100 kHz to 60 MHz and is powered by two 9 V batteries.
With this simple tester you can measure the gain of an NPN or PNP transistor. The instrument can...
This circuit was found in an Elektor from the 90s. The integrated circuits are not very common...
This elementary medium-wave radio was found in a publication from the 1970s. The handset must be...