# Twin T Drums (Practical Electronics 1978) **URL:** \ **Category:** DIY STUFF\ **Created:** [February 28, 2021, 12:01am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051 "2021-02-28T00:01:26Z")\ **Posts on this page:** 20\ **Page:** 5
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [August 17, 2021, 12:08pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/82 "2021-08-17T12:08:45Z")
> [@tamasgal](#): > > Or is it OK to go with ceramic ones? i don’t think personaly i would lengthen the legs of the caps ---
**Author:** ![tamasgal](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/tamasgal/32/16249_2.png) [@tamasgal](https://lookmumnocomputer.discourse.group/u/tamasgal)\ **Post date:** [November 3, 2021, 1:21pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/83 "2021-11-03T13:21:15Z")
Thanks Dud for the layout, I just built it and it’s amazing 😃 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [November 3, 2021, 1:26pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/84 "2021-11-03T13:26:22Z")
It’s really friendly but it’s not mine, it’s a @lookmumnocomputer layout 😉 ---
**Author:** ![tamasgal](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/tamasgal/32/16249_2.png) [@tamasgal](https://lookmumnocomputer.discourse.group/u/tamasgal)\ **Post date:** [November 3, 2021, 1:29pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/85 "2021-11-03T13:29:37Z")
I know, I was referring to the stripboard layout, which I have used to build it 🙂 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [November 3, 2021, 1:31pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/86 "2021-11-03T13:31:38Z")
Yes it’s stripboard layout of Sam : > **[STUFF - LOOK MUM NO COMPUTER](https://www.lookmumnocomputer.com/projects#/rhythm-generator)** > > Click on the images for more info on the projects, this is a work in progress and will build on the pages as i go. 🙂 ---
**Author:** ![tamasgal](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/tamasgal/32/16249_2.png) [@tamasgal](https://lookmumnocomputer.discourse.group/u/tamasgal)\ **Post date:** [November 3, 2021, 1:35pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/87 "2021-11-03T13:35:55Z")
Sorry for the confusion 😅 I was replying to this mini-thread: [Twin T Drums (Practical Electronics 1978) - #36 by BratAttack](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/36) My bad 😉 I’ll give Sam’s module also a try but I am missing two trimpots and a large enough stripboard, so I decided to go with the simpler one 😉 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [November 3, 2021, 1:42pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/88 "2021-11-03T13:42:30Z")
So you made the [Twin T Kick](https://lookmumnocomputer.discourse.group/t/simple-twin-t-kick-drum/2460) from @Krakenpine with my stripboard layout happy that’s work ! ---
**Author:** ![ehisforadam](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ehisforadam/32/21218_2.png) [@ehisforadam](https://lookmumnocomputer.discourse.group/u/ehisforadam)\ **Post date:** [December 18, 2021, 2:23am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/89 "2021-12-18T02:23:05Z")
Couple question about this circuit. I am working on a stripboard version of this, combining the original version with some of the changes for the module. I got the noise section done and I have been trying to test it because I am an engineer and like to test things. There is very little volume out of it, I just get a really faint pop. And I need to put in at least 6V. If I input on the other side of the 100nf cap it stays on and is quite a bit louder. Is the point of the cap on the input to act as a sort of timer? And it’s just super quite because there’s no amplification other than what my speaker is doing? I just want to make sure I am understanding this so I don’t frustrate myself chasing problems that aren’t there. Oh, I am in idiot…the inductors I had on hand are 100uH and this calls for 100mH…that probably doesn’t help me much. ---
**Author:** ![SYNTHGUY57](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/synthguy57/32/14422_2.png) [@SYNTHGUY57](https://lookmumnocomputer.discourse.group/u/SYNTHGUY57)\ **Post date:** [December 29, 2021, 9:08pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/90 "2021-12-29T21:08:30Z")
100uh and 100mH are different by the latter being 100000uh(100mH). So there could be a problem circui wise there mostly too ---
**Author:** ![AlphaCrucis](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alphacrucis/32/19405_2.png) [@AlphaCrucis](https://lookmumnocomputer.discourse.group/u/AlphaCrucis)\ **Post date:** [April 5, 2022, 12:19pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/91 "2022-04-05T12:19:32Z")
Both the updated and original stripboard layouts of the Rhythm Generator ([STUFF - LOOK MUM NO COMPUTER](https://www.lookmumnocomputer.com/projects#/rhythm-generator)) show a connection between pins 1-2, 5-6, 8-9, and 12-13 of the CD4011 IC. Yet, these connections are not visible in the actual stripboard when Sam @lookmumnocomputer zooms in. Are these pins connected or not? ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [April 5, 2022, 12:41pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/92 "2022-04-05T12:41:04Z")
They’re connected in the schematics in the magazine. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [April 5, 2022, 1:05pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/93 "2022-04-05T13:05:21Z")
and also connected in the #2700 module version > [@Twin T Drums (Practical Electronics 1978)](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/70): > > The updated stripboard And the schematic of the module [#2700](https://www.lookmumnocomputer.com/projects#/2700-twin-t-drummer) Also here ---
**Author:** ![AlphaCrucis](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alphacrucis/32/19405_2.png) [@AlphaCrucis](https://lookmumnocomputer.discourse.group/u/AlphaCrucis)\ **Post date:** [May 11, 2022, 7:54am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/94 "2022-05-11T07:54:46Z")
Hi Sam, did you ever try with the 4011UBE? Any thoughts? ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [May 11, 2022, 8:04am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/95 "2022-05-11T08:04:11Z")
Someone tested it with no succes, look at the begining of this thread there’s a lot of info about that. ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [May 11, 2022, 11:26am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/96 "2022-05-11T11:26:43Z")
Sam says it works in his version, with some resistor value changes: > [@\#2700 twin t drums](https://lookmumnocomputer.discourse.group/t/2700-twin-t-drums/3316): > > twin t’inspired by the practical electronics rhythm generator still needs a bit of fine tuning but I recon 3 weeks!!! keyboard sequencer is nearly done swell as the big mumma delay! PS ignore those preset potentiometers! meant to be the type in the other modules poking through the front but did not have the right values for this specific proto. !! this one definitely needs the whole thing doing with polyester capacitors or similar thats for sure. Ok so the 4011UBE 's tur… ---
**Author:** ![ehisforadam](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ehisforadam/32/21218_2.png) [@ehisforadam](https://lookmumnocomputer.discourse.group/u/ehisforadam)\ **Post date:** [May 17, 2022, 11:04pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/97 "2022-05-17T23:04:57Z")
Back to another project with these. To go with my all-in-one synth I am going to make a drum machine based around this project and using the Big Button as the sequencer. Specifically this enhanced version with MIDI [GitHub - matthewcieplak/hexdrum-midi: A MIDI-enabled fork of the LMNC big button](https://github.com/matthewcieplak/hexdrum-midi/) Parts are on order and working on my strip board. I was happy to find a larger size available off Amazon in the US so I don’t have to splice boards together this time. I gotta re-do a few things like, like adding the input resistors for the mixer, silly me. I am planning on sending the outs to 100K level pots before sending them into the mixer. I am also going to make the snare switchable, so you can chose between the High Bongo and Low Bongo via a DPDT switch. I am thinking I want to add a filter and delay control to the noise, but I am not exactly sure how to accomplish that, if anyone has any suggestions. ![Drum O Matic Schematic](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/a/c/ac9e260aab8d8054620d96fa910a23b8ef315677.png) ---
**Author:** ![Farabide](https://avatars.discourse-cdn.com/v4/letter/f/ecc23a/32.png) [@Farabide](https://lookmumnocomputer.discourse.group/u/Farabide)\ **Post date:** [May 18, 2022, 7:59am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/98 "2022-05-18T07:59:19Z")
The delay filter effect could be added as an insert loop, like a mixers. A dpdt switch could route the noise audio or you could pan into the loop with a pot. ---
**Author:** ![twinturbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)\ **Post date:** [May 25, 2022, 6:43am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/99 "2022-05-25T06:43:56Z")
It’s scary how old this thread is… I am trying to find out why Poly caps were used in the Module. Is it referenced somewhere? Thanks Rob ---
**Author:** ![ChristianBloch](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/christianbloch/32/56_2.png) [@ChristianBloch](https://lookmumnocomputer.discourse.group/u/ChristianBloch)\ **Post date:** [May 25, 2022, 9:15am UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/100 "2022-05-25T09:15:11Z")
Noise reduction……………… ---
**Author:** ![twinturbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)\ **Post date:** [May 25, 2022, 7:24pm UTC](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051/101 "2022-05-25T19:24:31Z")
Ahh, right that rings a bell but could not find it. Cheers [Previous page](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051.md?page=4) [Next page](https://lookmumnocomputer.discourse.group/t/twin-t-drums-practical-electronics-1978/3051.md?page=6)