Operating at a frequency of around 180 kHz, this transmitter was found in a Science & Electronics of 1970. The coil has 34 turns of 22 wire. The transistor can be the 2N2222.
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
This oscillator can be controlled by light if we use an LDR as a sensor, or by temperature, if we...
This xenon strobe light was found in a 2001 documentation and can be easily assembled today, as...