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Tube pedal project |
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| Side view - click for larger image | |
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| Top View - Click for larger image | Back View - Click for larger image. |
| Note: I did a bunch of updates to the original pedal #1 on 11/12/2005. The changes are noted below. | |
| Left: I updated this board by adding grounds from the Tube mounting screws to
the main ground buss. I used #6 ring terminals and ran two wires to the ground lug. See <-Socket grounds.
I also updated a couple wire runs that are not shown in this photo. The wire from the center of the volume pot pops up through the board right next to the tube socket and goes to pin 7. The filter cap wire that goes to pin 6 on valve 2 pops up through the board right next to the tube socket. Both of these new wire runs can be seen in the photo on the right, they are noted as <-New |
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| Right: The relay was eliminated and the hot switch mod is wired full time now.
The noise level was reduced a bunch by doing this. The 7812 voltage regulator was moved and bolted to the chassis for a heat sink. See 7812 in photo Ground wires were shuffled around and some were removed or condensed. The chassis is tied to the main ground buss through the volume pot. The volume pot body has a jumper wire soldered to the back of the pot that is connected to the black pot ground buss wire. |
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| This is the original circuit that I installed in my Tube pedal #1. See the next page for an updated circuit drawing. | Pedal power supply schematic
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7812 voltage regulator |
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This toroid power transformer is very small and is used here to make pre amp tube pedals. The normal use for a transformer like this is to step down wall voltage (120 vac or 240 vac) to 9 vac or 18 vac. I am using it to step up 12 vac up to about 240 vac so I can power a couple pre amp tubes. So I am inputting 12 volts ac into the secondary's and outputing roughly 240 volts ac from the primaries It has twin primaries and secondary's. You run the primaries in parallel and the secondaries in series. You use a 12 vac 1 amp wall wart to power it. It has PC board solder tabs and there is a small threaded mounting hole in the center on the back side so you cab bolt it down. The transformer wiring diagram is listed on this page. It's perfect for the project box shown in this project. I stock this pedal box on my web site store. |
The data sheet info for this transformer is shown below. Note that this data is listed as if you were hooking it up the normal way with 120 vac or 240 vac in and 9 vac or 18 vac out As noted above, I am inputting 12 vac into the secondary's and getting roughly 240 vac from the primaries 
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| Project pages - Page 1 - Page 2 - Page 3 - Page 4 | |
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