Recent content by brevor

  1. brevor

    Lowry C-500 organ pedals inoperative

    Have you checked that you have +24V on the pedal switch contacts? I used to work at Lowrey many years ago when the C-500 was in production.
  2. brevor

    For Sale: Dwyer CCS Current Switches (120 Qty.) $1000 NIB

    Please post your location.
  3. brevor

    Heat sink calculation

    I worked on those organs years ago, The triacs dont require heatsinks.
  4. brevor

    Cooling soldering iron quickly after use to reduce oxidation

    I thought Sal Ammoniac was hard in iron tips.
  5. brevor

    MCP23017 with raspberry pi

    On the MCP23017 all the I/O lines default to inputs on power up. You need to set them so all the relays will be off before you configure the I/O lines as outputs.
  6. brevor

    guitar circuit non isolated ground problem / short???

    Some fuzz pedals using Germanium transistors have this problem, this is because they use PNP transistors and the polarity of the power connections are reversed. The "ground" of the Germanium pedal is connected to the positive of the power supply. Other pedals have the ground connected to the...
  7. brevor

    Simulate the software before flashing

    Microchip's MPLAB software has a simulator called MPSIM built in.
  8. brevor

    Build a 120 vac to 18vdc Power Supply for DC Tool

    I agree, but I don't think even an "off the shelf" switch mode PSU would handle the startup current of that motor. My suggestion would be buy a new saw.
  9. brevor

    New to electronics, have a basic build

    Well, many people feel Arduino is the easiest to learn. I can't really comment much because I have never used one.
  10. brevor

    New to electronics, have a basic build

    Well then it comes back to what are the programming skills of the person doing the programming. It would not be helpful to you if we suggested a microcontroller your partner didnt know how to program.
  11. brevor

    The organ project

    0. Good,sounds like you are pretty well set then. The biggest cause of sound problems with old organs are dirty switch contacts. I would try turning on a voice for the upper keyboard such as horn or trumpet and hold down a few keys, while holding the keys try working some of the tab switches...
  12. brevor

    The organ project

    I used to work for Lowrey many years ago. If you look under the keyboard shelf there should be a plate with the model number. Let us know, maybe I can find where the sound is controlled from.
  13. brevor

    12VDC to 3.3VDC LED Metered after resistor

    Leave the circuit completed and measure across the battery and the resistor (separatly) and post your readings.
  14. brevor

    Switch help

    a photo would be better.
  15. brevor

    This some kind lightbulb or...

    Bulbs like yours are frequently wired across the telephone line connectors on alarm systems to shunt high voltage transients to ground to protect the circuitry.
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