Programmable Countdown Timer (CB25198E)

We found this circuit in the February 1989 issue of Radio Electronics magazine. The selectors are BCD programming switches. The circuit is CMOS.

| Clique na imagem para ampliar |

10.7 MHz Amplifier (CB4290E)
This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s...
Soldering Gun (CB26082E)
This electronic soldering gun circuit was found in the December 1998 Electronics Now magazine. The article...
Preamplifier for Walkman 741 (CB8462E)
Using a pair of 741 op amps, this 90 s Radio Electronics circuit works with the previous one. The...