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Custom Steller Electronics

Current Projects

I am making a meter board that I can use for all my toys.

It has 2 LED bar graphs (Left and Right) each with 19 LEDS.
I am setting it up for dBFS scale but its is micro-based so it could be anything.
I am using a huge 64 pin PIC (PIC16LF1947) with 53 I/O so I can do ANYTHING with it.
I have 2 ADC set up to read a AC signals from the output of my mic pre and compressors.
I uses a simple voltage divider with a TVS clamp to ensure the pic only see 5 volts on its input.

I have a Push button hooked up to toggle between the viewing modes or scaling for that matter.

So far I thinking:
RMS
PEAK
PEAK with max value linger
dBFS
VU
dBu etc...

Anyway the board is out to PCB shop and the code is mostly written.....

here is the schematic:
Meter-Schematic V0

here is the 2 sided layout:
Meter-PCB V0



Recent Projects

HPA -Headphone Amp- A 8 channel Personal Headphone amplifier.

This design is a 8 Channel Headphone Amplifier/ Personal mixer.
The Idea is to simplify headphone mixes for your clients. You send 8 channels out of your recording setup.

These would be sub mixes, stems or 8 things you like.
The musician then has 8 faders and pan knobs, a master bus 3 band eq and gain controls to configure their own headphone mix.

This idea is not new, but most boxes out there requires a controller and user interface….

The best part is you can daisy chain as many units as you like.
I used DB25 standard connectors, so you can hook this up with one cable.
Its really a handy box.

HPA Rev 2

m Steller Electronics

Lucid the Mic Pre Rev2

This is the latest version of Lucid R0. Lucid R2 is a tightly packed 1U single channel mic pre. This unit has the following features:


1) A switchable 20dB Pad.

2) A Z switch.

3) Switchable 48V Phantom with 7OOmA of current (Tuneable if you want...you can twiddle a pot inside).

4) Output polarity flip.

5) Gain of 80dB (20db from Jensen input xfmr, and 60 from the fisrt gain stage) with a 12 step switch and 5 dB fine trim pot.

6) A switchable Harmonics boost circuit with a saturation pot and a mix pot.

7) A switchable high Pass butterworth Filter (20dB/decade) the frequency is tunable from 10Hz to 1.5kHz.

8) A switchable low Pass butterworth Filter (20dB/decade) the frequency is tunable from 1.5kHz to 25kHz.

9) A Output gain attenation 12 postion Switch with upto 50dB of attentuation.

10) A Ouput Boost pot variable from 0 to 20dB.

11) A Class A enable push button. This changes the first stage amplifier from a Push pull high gain amplifer to a class A amplifer.


This Design uses no capacitors in the main signal path.

However the followng switchable sections do have capacitors in the audio path:

-The Harmonics boost circuit
-The Low pass Filter Circuit
-The High pass Filter Circuit

The Power supply is linear with significant EMI, Surge and noise protection on the front end.
There two seperate toridal transformers for power. One for +/- 18VDC and the other for +48VDc.

There are both input and output Jensen transformers. The input transfomer is double canned.


Lucid R2

m Steller Electronics

LUCID THe Mic Pre R0

I designed a 4 channel mic pre based on a class A circuit meant to be ultra transparent. As the gain is increased the neagtive feedback is decreased alowing soft sources to recorded with better clarity.

m Steller Electronics

m Steller Electronics

HEY DAD YOUR TOO LOUD!

m Steller Electronics

Pinky the Compressor V1

I have designed a new VCA based compressor that uses a pink noise filter to in the control path. The idea is to compress the audio the way we that we typically hear it. Currently I am designing a second version with expanded features.

m Steller Electronics

m Steller Electronics

m Steller Electronics



Old Designs

In the Past I have made pre-amps, compressors, power supplies, effects and equalizers. If you have an idea for a piece of studio gear and would like a custom design contact me. I try to keep my rates as reasonable as possible.

Modification and Repairs

I have modified a few Alesis 3630 Compressor to fix some power supply filtering issues. I did this by replacing some of op-amps and adding a lower distortion Class AB VCA and improved RMS level detector. As well I changed some of the critical capacitors.

I also developed a modification for the APEX 460 Vacuum tube microphone. Currently I am changed the capsule, transformer, tube, and some of the capacitors. As well as reducing the wire mesh on the wind screen

I also modded the Aphex 107 pre. I changed the tube, and a few op-amps. All and all the Aphex 107 is a nicely built unit, so it was a real joy to work on.

I have a ART tube Pac unit that I also modded. It was a real nightmare, and took quite a bit of work to improve. I fixed the heat issues caused by the poorly designed power supply, and added more filtering. As well I played with different tubes. I still find the compressor in it troublesome. I rarely use it these days because of that.

If you have any gear you would like help modifying or fixing send me a message I will do my best to help you. Check out my tips section for more electronics tips.




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