Found in a Motorola documentation from the 70s, this circuit makes use of transistors of the time. Modern equivalents can be used. The diode also supports an equivalent.
This circuit is from American documentation from the 90s. The configuration is very current and can...
This circuit trips when the voltage set in the pot is exceeded. The tone depends on C3 and...
This circuit uses only two general purpose transistors and can be powered by the circuit under...