This circuit was found in an Elektor from the 90s. It makes use of digital CMOS integrated devices common today. The signal is controlled automatically sequentially.
The transistor of this constant current source may be the BC548 or equivalent. Resistor R2 may be...
The LMV321 is a low voltage operational amplifier from ON Semiconductor. The following diagram,...
Two FETs connected as shown in the figure behave similarly to a light diode whose characteristics are the...