Address decoder using the 74LS138 (CB20537E)

This decoder circuit 3 of 8 was found in a publication for PCs from 1992. The circuits are TTL and must be powered with 5 V.

Variable Oscillator - Three Gates (CB108)
You can adjust the frequency produced by a ring oscillator with three inverters inserting a...
Class B Amplifier Stage (CB4248E)
This typical two-transformer push-pull step circuit can be found on many small old radios and...
FM Decoder (CB4601E)
Frequency modulated signals up to 500 kHz can be decoded with the PLL we show. The demodulated signal...