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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Biorhythm Circuit (CB24531E)
Found in a November 1977 Radio Electronics magazine, this digital circuit was described in an...
Precision Current Source (CB5139E)
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...
Sliding tone doorbell (CB20647E)
The tone generated by this bell changes when we press and release the switch. The circuit is from...