Found in a Popular Electronics from the 90s, this circuit uses components that are still current. The circuit triggers the vehicle's horn. The sensors can be increased in number.
We find this simple circuit that operates at a frequency of 5 to 10 MHz in an old English...
This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The...
We found this circuit in a 1980 publication. It can be applied to Triacs of the TIC series and the...