This circuit is from a 1924 book by Gernsback. The receiver uses two tubes and listens to headphones. Power is supplied by battery with the indicated voltages.
This circuit can provide a maximum load current of 1 A. The integrated circuit must have a...
This control for 12 V drills was found in a 90s Elektor. The components are current, and Q1 can be...
Figure 1 shows how the 4029 can be connected to count up to 10 and also up to 18. If pin 9 is...