Reading time: 2 minute Among the main topics discussed in this issue are: 25W audio amplifier; Dynamic limiter for perfect fidelity; Diode, thyristor and triac tester; RGA automatic manipulator; Agreement with Zener diodes; Acoustic enclosures with transmission line; Frequency doubler;
Reading time: 5 minute The vintage DIY electronic kit presented is an electronic assembly called "Audio Mixer", because with the help of voltage amplification stages the "mixture" of audio frequency signals provided by the microphone, tape recorder, electromagnetic dose or crystal is achieved. Of course, the assembly can be adapted for other types of inputs.
Reading time: 4 minute The assembly can be used to amplify the signals obtained from a pickup (vinyl player) with magnetic dose. The vintage DIY electronic kit presented is intended to familiarize the electronics technician with the performance and construction of preamplifiers with the corrected frequency characteristic.
