Sound level indicator (CB20737E)

Any small sound amplifier from 200mW to 1W can be used in this simple circuit. Or circuit of two 80s based on a trigger like 555.

| Clique na imagem para ampliar |

CMOS 555 With Variable Duty Cicle (CIR088E)
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...
Battery Charger (CB16778E)
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
NOR Crossed Gates (CB21500E)
This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used,...