Year: 2018

PRS Piezo Options

I’ve been looking at modding a PRS singlecut with a piezo pickup and a middle single coil. Models I’ve been looking at are:
– S2 Starla
– SE Zach Myers
– SE Tremonti
– SE Singlecut Trem

These all have a different bridge but are all a bit non-standard, so I’m documenting a little of my research as it took a little time and emailing to come across.

1) TonePros AVT2P
TonePros make a wraparound bridge that use standard tune-o-matic saddles. You can then get some piezo saddles from RMC Pickups

2) PRS Trem with RMC saddles
RMC also make some Piezo saddles to retrofit PRS tremolo bridges

3) Replace PRS Tremolo
You might be able replace the PRS tremolo with a 6 screw piezo, but the screw spacings might be slightly different, so might be hard to make it work:
– PRS seem to be 52.4mm (2-1/16″)
– LR Baggs (Vintage 6 screw) 53.98mm (2-1/8″)
– Fishman 56.38mm

4) Graphtech Wraparound
Graphtech make a complete replacement, but it’s pretty expensive and has 6 separate piezo leads that need to be fed to the cavity and joined using their circuit board.

5) Replace Tune-o-matic
If you have tune-o-matic bridge like the Starla or 245, there’s a pretty affordable bridge available on eBay, along with more expensive solutions from Fishman and LR Baggs.

6) Modify a PRS Trem
Because the tremolo block can be unscrewed from the top plate, you may be able to wedge an element between them like the video below. This might be worth experimenting with since it’s completely reversible and the elements themselves are only about $5.

7) ABM Piezo Wrap Around
AMB in germany used to make a wrap around piezo bridge, but when I contacted them said they no longer did due to low demand.

8) Q-Tuner Magnetic pickup
You may be able to add an additional Q-Tuner magnetic pickup, which has a large dynamic range and more capable of capturing an acoustic sound, especially when combined with something like the Fishman Aura Imaging DI.

Flip-Flop Loop Switcher / Dual Pedal Switcher

I have a couple of DIY overdrive pedals that I never have on at the same time. So I wanted to house them as a dual overdrive and then add Flip-Flop switching so that to go from one pedal to the other, instead of having to turn one off and the other on, you just turn on the one you want, and it automatically turns the other off. Could be used for a true bypass looper as well to switch pedals in the same manner externally.

So far I’ve done this with counter ICs. I planned to try and do it with a single dual J-K Flip-Flop with asynchronous reset, but I couldn’t get the clock debounce to work with that. Eventually, I came up with a clock circuit that works with a dual counter chip:

Schematic using dual counter chip:

Schematic using 2 counters. This uses a different debounce circuit which I’ve found to work with that chip:

I also chanced upon a debounce circuit that worked, when all the other types I found on the internet didn’t work that well with this particular IC chip. I’ve drawn out just that portion incase it’s useful to anybody else struggling with a chip clock timings. Even though both the 9V and GND should be AC ground, I found it would only work if I decoupled to both the positive and negative of the power supply: