Institute Newton C. Braga

Circuit Bench

Sub Carrier Generator (CB4241E)
The basic purpose of this circuit is to apply an audio signal to a video carrier for sound and...
30 MHz preamplifier (CB9151E)
Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This...
Sound-activated relay (CB7087E)
We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can...