This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two identical integrated preamp circuits. The ...

This is a low voltage microphone preamplifier circuit with a 1.5V power supply. The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100. Its output is fed ...

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 ...

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 ...

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 ...

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 ...

The casework is simpler, single transformers replace multi-transformers, and the board assembly has been simplified with no loss of component quality. The circuit boards are manufactured at Leema’s UK ...