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December 04, 2022, 11:00:35 PM

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Randall RF-1003 Footswitch for Randall RG1003H

Started by Montywitha-Y, September 26, 2022, 04:53:59 PM

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Montywitha-Y

I'd like to start by thanking you all for having me in your forum! I'm new to both solid state amps and to electronics builds. I am wondering if anyone here has a schematic or wiring diagram (makes noob blood boil just slightly less) for the foot switch that works with the Randall RG1003H amp head. It seems I'm deeply allergic to the idea of paying $100 for this foot switch (when they can even be found). If not, I would humbly ask if an owner of that foot switch could take a good picture of the layout and post it? Anything would help. Thanks, again!

joecool85

Quote from: Montywitha-Y on September 26, 2022, 04:53:59 PMI'd like to start by thanking you all for having me in your forum! I'm new to both solid state amps and to electronics builds. I am wondering if anyone here has a schematic or wiring diagram (makes noob blood boil just slightly less) for the foot switch that works with the Randall RG1003H amp head. It seems I'm deeply allergic to the idea of paying $100 for this foot switch (when they can even be found). If not, I would humbly ask if an owner of that foot switch could take a good picture of the layout and post it? Anything would help. Thanks, again!

I haven't looked this one up, but most amps just simply short the tip and sleeve of a 1/4" cable for the switch.  To test this, plug in a guitar cable, and then use a wire (or other piece of metal) and short the tip and sleeve - see if it changes the channel on the amp - it probably will.  If so, you'll need to determine if it needs a momentary or standard switch.  If it switches channel when you connect the two leads, then changes back to the original channel when you disconnect, you need a standard switch.  If it stays switched until you touch the leads together again, you need a momentary switch.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

Montywitha-Y

Thank you. I will test that as soon as I can. It is a 3 channel amp, so if there's any further technical info to make things work correctly to switch between the 3, I'd sure appreciate it. Like I said, I am new to these concepts and am looking for greater understanding. Thanks all!

joecool85

I looked up the manual for this and found it is a two button switch on a TRS 1/4 cable.  This just means it uses a stereo 1/4" cable rather than standard mono guitar cable.  Testing will be the same way, but you will go from the ground at sleeve (ring closest to the wire) to the tip or to the middle ring.

https://www.randallamplifiers.com/wp-content/uploads/sites/9/2019/09/RG1003HMANUAL.pdf
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com


Montywitha-Y

#5
I hate to belabor this but I have built this foot switch to the best of my knowledge but button 1 switches between channels 1 and 2 just fine and button 2 does nothing, so I am unable to switch to channel 3. Any further suggestions would be amazing and appreciated. Also, again, if anyone has this switcher, I would deeply appreciate any interior photos of the layout. Thanks again!

g1

joecool85 explained how to test whether you needed momentary or latching type switches.  What were the results of that test?

Montywitha-Y

Results indicated the need for momentary switches. I built the box with momentary switches and got the result I mentioned above.

joecool85

Quote from: Montywitha-Y on October 06, 2022, 01:40:03 PMI hate to belabor this but I have built this foot switch to the best of my knowledge but button 1 switches between channels 1 and 2 just fine and button 2 does nothing, so I am unable to switch to channel 3. Any further suggestions would be amazing and appreciated. Also, again, if anyone has this switcher, I would deeply appreciate any interior photos of the layout. Thanks again!

First, I'm assuming you are using a TRS (stereo, three conductors) cable?  If not, that is the issue.  If so, you should be able to connect the ring and sleeve together for the second switch.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

Montywitha-Y

Yes. I am using a TRS cable and stereo output jack. Would you mind clarifying your last sentence as if you were talking to a child😀?

phatt

I think Joe means you have a TRS  (Tip Ring Sleeve)

Short the Tip to the Ring gives you the 3rd possible connection which may trigger the 3rd option.
Phil.

Tassieviking

There are no stupid questions.
There are only stupid mistakes.

g1

When you were doing the tests to see if you needed momentary or latching switch, how did you get it to engage channel 3 ?

Montywitha-Y

Grounding out the very tip of the plug switched it to channel 3. Grounding the ring made it switch between 1 and 2.

g1

Quote from: Montywitha-Y on October 08, 2022, 07:16:13 PMGrounding out the very tip of the plug switched it to channel 3. Grounding the ring made it switch between 1 and 2.
Do you have an ohm-meter to check your work?
put one probe at the plug tip and one at the sleeve (ground)
When you push the switch it should read 0 ohms, when not pushing switch it should read 'OL' or similar.

If you don't have a meter, post some pictures of the wiring at the plug and switches.