Touch switch (CB8727E)

Found in a 90s Popular Electronics, this touch switch uses a single sensor. PLLs are common today. Observe the supply voltage range.

| Clique na imagem para ampliar |

Transformer Amplifier Stage (CB966E)
This is stage is transformer coupled and was found in na old publication of the year 1958. The...
Audio compressor (CB20655E)
This circuit is from the magazine 73, for radio amateurs, from the 80s. The circuit uses common...
Tilt indicator (CB9492E)
This indicator circuit used and game machines (arcades) to indicate that the machine is being...