Wien Bridge
This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends basically on C2 and C4. The circuit is from an Electronics Now from December 1993.
This pocket-sized VHF receiver was found in Radio Electronics magazine from January 1961. It uses...
The integrated circuit used in this old configuration is not common today. In it we have the way...
The difference between this circuit and the previous one is that it uses PNP transistors. The...