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Yeah Kevin gave me some ideas. So one workaround I found was to: 1. make the board larger. 2. router 3. make the board smaller, creating the castellated holes. 4. accept DRC Dimension errors. I did this, and sent the file the JLC. It seemed to take it fine. But the upcharge on castellated holes...

I’m trying to do castellated holes in Eagle. I get a DRC Dimension error which I can approve. But the auto router won’t route the holes. Any ideas?

The picture up in Post 6, after adding adding the 2nd buffer, I am getting some switch pop. I'm using a momentary switch to a relay, so the pop is likely a voltage difference somewhere. And it's interesting, it gets better the more I switch it, like a capacitor discharging. In the below...

I need (prefer) thru hole

Based on other PPCB threads, the J113 seems to be an acceptable alternative to the J201. 10x cheaper.

Just to clarify, when I say TUNER, it isn't a stand alone tuner that you buy. We are designing a tuner pedal using a CYD (Cheap Yellow Display) with an onboard esp32 MCU. So it doesn't have any impedance other than what I give it. Last night I tested this using 2 J201's I had. It worked. C1...

So then like this, using the other side of the relay. Monitor mode bypasses that side of the relay but requires a buffer.

So then like this. Other side of relay disconnects that portion of circuit when in TB mode.

I'm developing a tuner pedal, and trying to give the option of True Bypass or Buffered Bypass. The JFET splitter/buffer I'm copying from AMZ (PPCB uses similar). I've always understood that TB means the signal doesn't go through any IC's, chips, or anything that is powered. But can go through...

I guess one question I have for this is, in TB mode, is this still considered True Bypass? Signal is still flowing through C6 and into the tuner through the Tuner Buffer. I would think the buffer creates a high enough impedance such that it doesn't affect the signal going through the True Bypass...

Using the AMZ splitter, I think this works. Any suggestions?

To do monitor output (tuning unmuted), I think I need a splitter. AMZ has a JFET splitter option. Where could I find an op amp splitter circuit? PPCB has a splitter, but the schematic isn’t posted @Robert

Yeah LCD displays are notorious for noise. We found a 5khz noise in our display and was able to turn it off through programming. We have a separate ground for the display, we think this has the noise issue covered. But I’ll try what you suggest.

That IS the plan. My partner @joulupukki and I Hope to offer a DIY kit… we’re getting close. Couple more months maybe. I think our tuning algorithm and smoothing is AS GOOD or possibly BETTER than the top 3. (Turbo, Peterson, Polytune3). I’m a tuning snob, but I find I prefer tuning with Qtune...

Here's my tuner, I have 2 prototypes. The one on the right I've modified to add a J201 fet buffer (post #1) on the output. Currently the board has an LM358 and uses 1 op amp for the tuning circuit gain and the other as a buffer into the ESP32 that processes the tuning. I played through it on my...

Good read. So which version (fet or opamp) would color my tone the least? It looks like the PPCB one I show above, is the front end of the Dr. Quack Envelop Filter.

Anyone care to compare/contrast the PPCB Mini JFET Buffer with others. It's really simple. What are it's limitations? Wanting to add it to a True Bypass tuner.

Anyone know what kind of momentary TCE uses on the Polytune 3? I'm assuming it's mounted to a PCB on a 90 degree angle. 3 is tuning mode 5 is display mode

It was R20! I had 392R instead of 392k. What oddball sizes, I'm shocked I had both. I made the same mistake on a previous build. I checked the color codes of all the resistor and the Orange White Red was right, just missed the multiplier.

You are spot on. Before R16 I get a nice strong signal. But the junction between R16 and IC2APin2, I get nothing. Then on IC2APin1, I get a faint signal. So C12, R17, R18? Or possibly R7, R19 or C16, that's the tantalum cap that I replaced with an electrolytic? I should note the volume pot does...