This modification lets the lavaliere microphone preamplifier be used as a portable mini megaphone ... Class D audio amplifiers have lower power dissipation and produce less heat, save circuit board ...

The microphone preamplifier circuit works great with dynamic and electret condenser ... First, I built the power amplifier circuit neatly on a piece of perforated prototyping board with discrete ...

Thus to have a usable audio signal level a high-voltage bias supply is required to provide the charge, and a very high impedance preamplifier circuit to catch the signal without draining the ...

It’s one of these, an ECH83 triode-heptode, which [mircemk] has taken as the basis of an audio preamplifier circuit. The preamp circuit is pretty simple, being a two-stage single-ended design ...

Parasound introduced an improved version of its Halo JC 3 phono preamplifier, called the Halo JC 3+, which adds independent load adjustment for moving coil cartridges, as well as enhancements to the ...

Limited edition, two-box Reference Anniversary preamp will only be made until ... are mounted on the bottom of the main circuit board. All key components are designed and manufactured solely for Audio ...