Burglar Alarm (CB6443E)

This circuit is from a 1991 Hobbyst Handbok. The circuit uses a small 6V secondary transformer to operate on a miniature xenon lamp inverter.

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5W Amplifier (CB24852E)
Using the ULN-3784B this circuit typically supplies 5 W at 24 W. However, it can operate from 9 V....
Universal Preamplifier for Microphone (CB960E)
This circuit, from a former publication of 1968 was originally designed for germanium transistors, but with the...
Display Demonstrator (CB24385E)
This circuit simulates an 18-point digital display using light bulbs, but can be adapted to use...