Tremshifter by Dead Astronaut

9/22/2014

Here is a very cool optical filter/tremolo by Dead Astronaut. Built and verified today - works perfectly. :)

Vitt

3/5/2015 04:45:52 am

Hi, i'm building this layout but i can't get it to work. the pots seems to have no effect on the signal. I don't understand why.

Fredrik Lyxzén link

3/5/2015 06:51:29 am

Hi
Sorry to hear that you are having problems.

Have you attached the rate indicator LED's aswell? They are actually needed to complete the circuit (for at least either the tremolo or the filter, can't remember which it is). The LED's will also be nice to see if you have the LFO's running.

I suggest you ask in the thread on tagboardeffects: http://guitar-fx-layouts.42897.x6.nabble.com/Tremshifter-by-Dead-Astronaut-Verified-td13056.html;cid=1422013218853-996

More people will have a chance to help you there.
I hope you get it working. :) Good luck,
cheers / Fredrik

grm link

4/16/2015 05:05:35 am

hey,

thanks for this layout. i've build it now, but i used TL082 instead of TL072, they shall be working the same, the 082 is just a "new and improved" model, the dude in the electronic parts shop said. never the less i have the problem of a mighty HUM, with this circuit. this hum is faintly modulated by the filter- and tremolo section, all pots exept volume are functioning and i have made very sure that there are no solderbridges. this HUM can't really be a problem of the values of the LDR i used (couldn't source the specified ones), i guess.

if you have any ideas for what i can check my build i would be very thankful if you tell them to me.

thanks.

Fredrik Lyxzén link

4/16/2015 06:39:39 am

Hi!
The TL082 is the general purpose version, the TL072 is the low noise version (prefered in audio applications) and the TL062 is the low power version. But that should not matter in this case. It sounds to me like you have a grounding issue somewhere. I would start by checking the offboard wiring, then go over the ground connections on the board with a multimeter. I hope that helps :) / Fredrik

grm link

4/16/2015 11:35:07 pm

thanks for your reply.

yes, it sounded just like that.

during my attempts to measure the grounds i found out that my supposedly 9V power supply was feeding almost 12V into the circuit. when i've changed it to another with 9V the sound changed to a higher pitch, more like a ringing sound. still the functions of the filter and tremolo section are working faintly on the signal the circuit produces itself. i've changes all the chips now, with no change in sound emission.

for now i've confirmed that in fact all ground trails are connected on and off the board. what else can i do to find the mistake i've made?

Fredrik Lyxzén link

4/20/2015 08:46:09 pm

Sorry, I don't know what else to do. Just check the usual stuff, solder bridges, misplaced components ect. You might get more help if you ask in the tagboardeffects forum thread (which I posted a link to in another reply here). Good luck. I hope you get it working.

cheers / Fredrik

mug81

3/29/2016 03:45:36 am

Hey Fredrik, thanks for sharing this magnificent layout - fired up right after I sorted a faulty TL072 out - and sounds really cool! Cheers from Bavaria!

Fredrik Lyxzén link

3/29/2016 05:58:42 am

Hi, Thanks for commenting. I'm glad to hear that your got it up and running! :) Cheers / Fredrik

7/20/2016 08:45:58 pm

HI, Is there a double link at point G G? Or the point FF connects straight to G I? THanks

Fredrik Lyxzén link

7/21/2016 05:56:28 am

Hi
Yes, there is a double link there.
Cheers / Fredrik

7/22/2016 07:48:17 am

Thanks for the reply. I will start this build tmr. Can't wait. Btw, is there a subsitute for the vol pot? On Tayda, I can't find 22k lin pot. Would a 20k do? Also just curious, regarding the value of the resistors. I'm using normally the 1/4 W carbon resistors. I've seen in some places that ppl, used the 1/4W Metal resistors. Is there really any difference in sound and quality?

agung

4/13/2017 03:01:17 pm

nice tremolo .is work use ldr and led.tl072.5532.062 work fine? want build this

agung

4/21/2017 09:07:09 am

thank man . just use TL072 & B1M for pot speed. funny sound

https://youtu.be/doXiFVtYXLo

Fredrik Lyxzén link

5/6/2017 03:49:12 am

Cool. Thanks for sharing. :)
I missed your first comment. Glad you it working.
Cheers / Fredrik

Kerry

5/17/2019 01:21:53 pm

Is there supposed to be a double link at ic1? The way it’s drawn makes it seem like it is meant to be a double.

Fredrik Lyxzén

5/18/2019 05:47:16 am

Yes, it's a double link there

mjv913

8/15/2021 01:09:49 pm

100% verified and sounds amazing! Just like the demo vids. I cant wait to box it!
I used all TL072s at first which worked but it was started to sound real bacon-y when strumming hard and It had a little clock noise from the filter. After swapping out all the ICs with little difference i started trying other dual op amps. I settled on a JRC4558 for IC1 and TL072s for ICs 2 and 3. Its perfect now, no bacon frying and only hear clock noise when my amp is maxed.
Overall, its a brillient circuit. The filter alone makes a great psudo phaser and the tremolo does the usual tremolo things from machine gun to super duper slower than youd ever realistically need.
Im thinking about changing the shape switch for a 500k pot so i can blend between square wave and sine wave and possibly putting the filter onto a footswitch, though ill probably leave it on as thats where this pedal really shines.

mjv913

8/18/2021 12:11:33 pm

Finished and boxed. I love this thing!
Switching the waveshape switch for a 500kb pot worked a charm. Now it can go from a triangle wave to buttery smooth about half way then choppy helicopteresque when fully clockwise. I chose not to put the filter on a footswitch and im glad i didn't. Id rather have a way to turn off the tremolo and just leave the phaser/filter on.
Heres a lazy 2am demo, ill try post a better one soon..

https://youtu.be/nhfYMAs-86k

https://youtu.be/vNFbjoJf5l4

Fredrik Lyxzén link

8/27/2021 07:14:37 am

Awesome. Thank you for the build report. I'm glad these old vero layouts are coming to good use. Dead Astonaut did a great job on this circuit. Cheers / Fredrik

Tremshifter by Dead Astronaut

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