2N4987 and 2N4990 (IP057E)

Unilateral switch (SUS) with 8 V of trigger voltage. This component is used to control SCRs and other applications.

Vox (CB9423E)
This relay triggered by voice or by another sound was found in an Elektor from the 90's. The...
12 V regulator with 1 A (CB9155E)
Found in an EDN from the 90s, this regulator makes use of the integrated circuit of the time. The...
Touch Switch (CB16251E)
This circuit consists of a design improvement that we have previously published (1982), obtaining a new...