This circuit is used to detect PLL signals from the 4046 IC. The circuit is from an Electronics Now from October 1994. The indication is made through LEDs.
Books and e-Books by Institute NCB 100 CIRCUITS - SHIELDS FOR ARDUINO FUN PROJECTS FOR THE...
Details of the coil of this two-transistor generative receiver were not given. We found it in a...
Found in a 1969’s Electronic Design, this circuit operates in a narrow range of voltages....