This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated at up to 12 V and 100 mA. The transistor is a general purpose transistor.
August 2016 - It can be obtained from Mouser Electronics the new clock buffers HMC7043 of Analog...
This circuit contains a voltage doubler that comprises two diodes and two capacitors, in order to...
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...