30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Light interrupt pulse generator (CB4943E)
This circuit generates a pulse of duration determined by the capacitor when an object interrupts the...
Pyroelectric Detector (CB25377E)
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...
4046 Triggered VCO (CB25250E)
This wideband circuit with the 4046 PLL was found in the December 1989 Radio Electronics magazine. The...