We found this circuit in the March 1995 issue of Electronics Now magazine. The circuit has a frequency range determined by C1 and R3. The signal generated is square.
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
This sensitive circuit was found in the June 1995 Electronics Now magazine. R1 can be from 10k to 1M...
This audible continuity test was obtained in a book from the 90's describing simple projects. The...