This PA or Public Address amplifier with a few watts of power was found in the March 1986 Radio Electronics magazine. It uses two LM380 ICs in bridge mode for higher power.
This wireless intercom has a range of about 300 meters using an integrated circuit that is not...
The operating principle of the VCO shown in figure 2 is the same as the previous circuit...
We found this circuit in a technical documentation from the 70s. It can be implemented with more...