3 Relay Switching Board (Ver 2)


Now shipping Version 2, featuring a voltage regulated power supply.

The 3 Relay Switching Board is a versatile add-on board that has three DPDT 5V relays and a regulated power supply all on one board. It can be powered from either a 5VAC rectifier tap or 6.3VAC filament tap (as long as the switching ground is floating and not reference to the same ground as the filament center tap).We've found that doing this, and referencing the board ground (marked 'G') to chassis ground, provides for an extremely quiet installation, even in high gain applications.

It was originally designed by Ampdoc for use in the Overdrive Special type amps, but can be used to switch any functions via 1, 2, or 3 button footswitches as needed. The board also has terminals to accommodate chassis-mounted LEDs, and can also be split/snapped into sections to fit almost any chassis - just connect jumpers from the B+ (supply voltage, NOT plate high voltage!) and Ground terminals to each section. An example wiring diagram is provided and can also be downloaded here. Wire, standoffs, etc. are not included and should be provided by user.

DISCLAIMER: User assumes all risks. Performing these modifications will most likely void the warranty on your amplifier. Working on amps can be deadly if you do not take proper precautions. Read and follow the diagram or instructions very carefully. Basic soldering skills and basic user-supplied tools are required. If you are at all unsure of your ability to perform these modifications STOP and take your amp to a professional to be modified. You can also send your amp to us for modification. Contact us for pricing.

DIFFICULTY LEVEL: ADVANCED [Follow safety guidelines for working with electricity. Advanced soldering skills and knowledge of working with AC/DC circuits. Identify all terminals of electronic components using data sheets. Read resistor color codes and capacitor values, as well as identify PNP, NPN, JFET, MOSFET semiconductor devices. Understand relay and switching logic. Measure and connect high and low voltage AC and DC. Understand advanced working of vacuum tubes. Use all functions of a multimeter. Understand Ohms law and apply to basic and advanced circuits. Work with advanced hand and power tools.]

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  • Model: 3RLYSWBOARD
  • Shipping Weight: 0.25lbs
  • 31 Units in Stock
  • Manufactured by: Granger

This product was added to our catalog on Sunday 09 January, 2011.

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