This balance or balance circuit with phase inversion was found in documentation from the 90s. Transistors can be low noise equivalents like BC549.
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...
This circuit differs from the previous ones by using the 7402, which consists of 4 two-inputs NOR...
The pass-through alarm we present uses an infrared (IR) emitter as a sensor. When cutting the...