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1176LN Audio Compressor

1176 front angle kyoritsu

A clone of the classic Urei 1176LN compressor, with some extra features added.

Here you will find details of the construction of a unit with two of these compressor modules using the Mnats version J PCB.

Calibration, testing and troubleshooting information is also included.

AX1250 Microphone Preamplifier

image 5  

The AX1250 microphone preamplifier features 4 channels with gain from -12dB to +66dB, switched in 6dB increments with a trim of +/-6dB for each increment, independent LED metering on each channel, phantom power and a bypassable insert per channel.

VU Meter

vumeter category

A 2-channel VU meter built from a few spare parts.

It has nice big Kyoritsu meters and separate calibration controls on the front panel to allow simple alignment. You could use whatever VU meters you have available.

XLR in and out jacks for each channel on the back allow it to be inserted in line with the bus to the monitor switch.

Balance Check Monitor

Speaker

A stereo balanced input mono balance check monitor.

Uses a 5" driver and has balanced stereo summing module, power amplifier and power supply on a single chassis plate as a complete solution.

XLR inputs for the stereo line signals and IEC mains input for power.

PSU Modules

psu8 category  

A range of general-purpose power supply modules used in many of the projects.

Single rail, dual rail and triple rail supplies are presented here using linear regulation, making them useful for audio projects.

Audio Monitor Selector

isu1 intro  

An audio selector unit for two balanced inputs and four balanced outputs.

It features a trim control for each output and an attenuator from 0dB to -10dB in 2dB steps.

Power Sequencer Module

front 2  

A 4 channel power sequencer to allow sequenced power up and power down of equipment with a 1.5 second gap between each.

Useful for powering up and down audio equipment in the right order to prevent thumps.

Balanced Stereo Line Mixer

lmx1 category  

A modular balanced stereo line mixer with headphone module.

This simple balanced stereo line mixer was designed for use in the studio with external sources such as CD and DVD players, synths, i-devices etc that were played back on the monitors but not going through the DAW.

The modular approach consists of a stereo input module, stereo output module, headphone amplifier module and metering. The modules may be used independently if desired, with the headphone amplifier module being a high quality stereo headphone amplifier.

Balanced stereo to mono converter

BIM-2 Module

 
A 2-channel balanced input to mono unbalanced output. Electrically sums the two inputs, converting a stereo balanced input to a mono output. 

Power Amplifier Modules

PA-1 module  Power amplifier modules for general purpose audio and hi-fi use.

Audio Bypass and Changeover Modules

ABM-1 module 

The audio bypass module provides relay-switched audio bypass functionality between the balanced input and output and the XLR FX in/out chain. Used in a variety of situations where simple true bypass functionality is required.

The audio changeover module can be inserted into a bypass module chain to provide either L/R channel changeover, or polarity reverse on the balanced signals.

Mono Summing Module

msm1 front2  

A balanced 2-channel input is summed and output as a balanced mono output.

This can be used to feed a mono reference monitor to check for mono compatibility of audio mixes.

Parts Management System

 

An engineering parts management system allows you to keep track of parts, components, documentation and BOMs.

Easy to set up on a LAMP server.

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  • 1176LN FET Matching
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  • Audio Monitor Selector Unit
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Projects

  • 1176LN Audio Compressor
  • AX1250 Microphone Preamplifier
  • VU Meter
  • Balance Check Monitor
  • PSU Modules
  • Audio Monitor Selector
  • Power Sequencer Module
  • Balanced Stereo Line Mixer
  • Balanced stereo to mono converter
  • Power Amplifier Modules
  • Audio Bypass and Changeover Modules
  • Mono Summing Module
  • Parts Management System

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