This circuit was found in a 1975 documentation. The SCR can be of any type and in this case, we have the horn activation. The relay must be a 12 V type with high contact current.
The integrated circuit of this amplifier is not very common today. The output transistors can be...
This circuit produces a loud sound in the speaker when water level reaches the sensor. The power...
This circuit was found in a Linear Technology documentation from the 90's. The integrated circuits are...