The purpose of this 2000 documentation circuit is to decode SSB (BLU) signals to be audible on communications receivers that do not have this feature. The circuit is for 455 kHz FIs, in which function the crystals are chosen.
Microchip's MCP6411 Operational Amplifier can operate at voltages of 1.7 V and has a quiescent...
This amplifier for public address was found in English documentation from 1967. The transistors are from...
In its first version this article was written in Portuguese for a Brazilian magazine and...