Found in a 1970 American publication, this circuit uses transistors of the time. These transistors may be replaced by current equivalents. The factor Q is greater than 3 000.
This circuit uses a JFET, which may be of the type BF244 or BF245 and a PNP bipolar that may be...
November 2016 - Lumileds' new high power Luxeon 5050 LEDs can now be purchased from Mouser...
Figure 1 shows a simple audio oscillator driven by the SCR When the sensor is closed. The circuit...