Simple 6 to 60 second timer 555 (CB25863E)

This circuit was found in the June 1995 Electroics Now magazine. The relay should be a sensitive type with up to 100 mA trigger current.

| Clique na imagem para ampliar |

Low Noise Pre Amplifier (CB13682E)
The power supply for this 1972 circuit must be symmetrical and the BC549 transistors. Care with...
Double limit comparator (CB9581E)
Found in documentation from the 1980s, this circuit makes use of general-purpose diodes and...
Weak Signal Differential Detector (CB6665E)
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...