This circuit aims to increase the selectivity of receivers whose FI is 455 kHz. The circuit is from 1975 documentation. The transistors can be the modern BF494 equivalents.
This extremely slow circuit produces one pulse per month and can be used in a timer. We found it...
This circuit was found in a 1964 Electronic Design. The circuit delays the firing of a load for a...
Found in a documentation from the 90's, this circuit already includes an amplification stage. The...