The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This simple circuit serves to demonstrate the working principle of a Set-Reset flip-flop (S-R or...
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This amplified circuit was found in a magazine for radio amateurs 73 of the 90s. The circuit uses an...