This circuit was found in Philips documentation from 1967. The components are of the time, being transistors like BCY38 for TR1, BC108 for TR3, and others depending on currents.
This inverter can source voltages up to 400 V from a 3 to 6 V supply, but output current is very...
This shoot-to-target game uses well-known CMOS circuits and the player hits the LED by squeezing...
This indicator for audio signals uses only 3 components. LEDs are common and the audio signal with...