| 4 button footwsitch [message #13851] |
Thu, 03 June 2010 14:22  |
Van
Messages: 134
Registered: April 2004
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Senior Member |
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Sorry for my ignorance, I'm trying to understand the schematic Don emailed me.
What type are the original switches? DPST?
What is the voltage rating of the bulbs? Wattage?
The resistors are 330 ohm, correct?
I'm attempting to build one of these.
THANKS!!
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| Re: 4 button footwsitch [message #13852 is a reply to message #13851] |
Thu, 03 June 2010 16:00  |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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The switches are Single Pole Double Throw, SPDT. One contact (pole) that can be connected to two points (throws).
You can use one half of a double pole switch if you can't find the single pole type.
The bulbs are GE335 or equivalent. 28v, I'd have to look up the current rating. Edit: 0.04 amps
The resistors are 330 ohms 1/2 watt.
[Updated on: Thu, 03 June 2010 16:25] Report message to a moderator |
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| Re: 4 button footwsitch [message #13854 is a reply to message #13852] |
Thu, 03 June 2010 16:08 |
Van
Messages: 134
Registered: April 2004
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Senior Member |
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Thank you!
SPDT now makes sense to me. Grounding turns off the effect.
I wonder if I could just use LED indicators instead of the light up windows for the bulbs.
I'll have to see if there are 28V LEDs out there.
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| Re: 4 button footwsitch [message #13855 is a reply to message #13851] |
Thu, 03 June 2010 16:23 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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The effect is turned off when the correct pin is grounded. The light turns on when the pin is open and the light is grounded.
The original foot switch had little backlit name labels for each effect. The bulbs were turned on slightly through the 300 ohm resistor so that you could read the label. When the effect was turned on the bulb lit up to full brightness.
If you want to use leds instead of the bulbs you just need to use a series resistor to limit the current through the led. You can also eliminate the 330 ohm resistors.
[Updated on: Thu, 03 June 2010 16:24] Report message to a moderator |
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| Re: 4 button footwsitch [message #13874 is a reply to message #13851] |
Sat, 05 June 2010 14:05 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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Great job! Now you can rock like it's 1972 again.
I'd probably prefer having the cable for the footswitch on the backside of the box, out of the way. Maybe you have a reason for the front mount.
Anyway great job.
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