This balance or balance circuit with phase inversion was found in documentation from the 90s. Transistors can be low noise equivalents like BC549.
We found this circuit in a 1977 technical documentation. Its purpose is to protect instruments against...
This circuit is from a 1995 publication; The current is obtained by dividing 1.25 by R1. The...
This flasher with a small incandescent lamp was obtained in a documentation from the 80's. The...