This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid of an electric typewriter of the time.
This 2002 circuit uses many more electrical components than electronics. The keys are common, and...
This circuit is from the National Semiconductor CMOS manual of 1977. What this circuit does is to...
This circuit warns you if you forget to turn off the car light and leave it. The circuit is from a...