4053 Hex SPDT Switch

analog_backlash · Posted: Sun Apr 07, 2013 10:29 am Post subject: 4053 Hex SPDT Switch

Hi All.

Just thought I'd put my latest lunetta circuit up. I don't know if it's totally original, but I couldn't find another one exactly the same anyway. My idea was to produce an interesting long sequence by switching between two modulation sources using the "SPDT switches" in a CMOS 4053. I wanted at least 4 switches, so I used 2 x 4053, giving 6 switches. I have attached the schematic below (I've finally got around to using some CAD software). I've also attached an mp3 demo of the efffects. The patch was as follows:

The first 4 switch control inputs were connected to outputs Q5-Q8 of a 4040 counter (which was connected to reset after the eighth output). The 4040 was clocked by a 40106 LFO.

The first 4 switch "poles" were connected to a (slightly modified) PHOBoS R/2R circuit, see:

http://electro-music.com/forum/topic-55465.html

The first 4 "normally ons" were connected to selected steps of a 4017 in a modified Casper 4 x 8 sequencer, see:

http://casperelectronics.com/finished-pieces/sequencers/step-sequencer/

This was clocked by Q2 of the 4040 (i.e. a quarter of the LFO frequency).

The first 4 "normally offs" were connected to the Q1-Q4 outputs of the 4040.

All of this means that the output of the R/2R is modulated by a complex sequence of mixed binary counting (4040) and the selected 4017 outputs. It is a finite sequence, which in this case repeats every 30 seconds (roughly). I finally fed the R/2R output into the CV input of PHOBoS' 4046 VCO (same link as the R/2R). The recording has this ouput, first straight and then with the glide turned on.

As a further source of modulation, you can use the inhibit pins of the 4053s. This only affects the "normally off" parts of the sequence. The secord part of the recording (after a fade-out) shows the effect of this, first without glide and then with glide. The inhibit was modulated using a second 40106 LFO.

Since these switches are transmission gates, the signals can be sent in either direction and (I think) you could also send audio signals through them (but you'd probably need to add capacitors to the inputs and outputs).

I hope that this all makes sense! Let me know if you think of any changes that could be made to improve the circuit - I'm eager to learn.

Gary

4053 Hex SPDT Demo.mp3

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4053 Hex SPDT Switch.bmp

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Draal · Posted: Mon Apr 08, 2013 7:43 am Post subject:

Cool use for the 4053's Cool

If it don't burn up and shatter the windows, I'm okay with leaving an effect as is. Love the melodic sequences there. I've used the 4052, 4051, and the 4512 (similar in function) to create fun beats and patterns. Any lunetta build, big or small, can benefit from them. Good work!

analog_backlash · Posted: Mon Apr 08, 2013 3:50 pm Post subject:

Thanks for that Draal. There seems to be a really great scope for this kind of circuit in building up complex (and hopefully interesting) sequences.

PHOBoS

PHOBoS - 4 x 5 = 3.mp3

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featuring sounds by analog_backlash

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analog_backlash · Posted: Tue Apr 09, 2013 11:40 am Post subject:

I really liked that again PHOBoS! It's rather different to the dissonant recording that I did a couple of days ago. I faded in three 40106 drones, then four gated 4093 bass notes (controlled by the Casper-style sequencer) and finally that sequence (or something very similar anyway). The glide comes in about 2/3 of the way through it. There's also a bit of reverb from my old BBD echo. See what you think...

Gary

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PHOBoS · Posted: Tue Apr 09, 2013 6:05 pm Post subject:

I like that Smile

gives me the impression of something approaching
(no, not a shark,. but I'm not sure if it's a entirely friendly either,. it seems to have fun though)

RingMad · Posted: Wed Apr 10, 2013 4:08 pm Post subject:

Nice sounds, guys! I'm a little too braindead to understand the circuit right now (I just finally finished a challenging repair of an addition I made to my crazy speaker installation control box... it involved a 4053 at the heart of it... then I noticed something didn't work right and added a 4066... and that still didn't work so now after adding a 4081, it works.... uh, anyway... nice sounds!)

James.

analog_backlash · Posted: Wed Apr 10, 2013 5:23 pm Post subject:

Thanks PHOBoS/James.

analog_backlash · Posted: Thu Apr 11, 2013 8:16 am Post subject: Updated Schematic

Hi.

I've made a small change to the schematic, so that you can switch the inputs/outputs between +6V and 0V. I originally just had the +6V, as I read that this minimises the pops if you pass audio through the switch. However, I found that with some digital circuits, this was causing problems and pulling them down to 0V was best (hence the switch).

A question for PHOBoS. I have also built your Bandersnatch RND Generator:

http://electro-music.com/forum/topic-55756.html

This seemed to be working fine, until I connected the clock input of the RND to any of my 4053 switch inputs/outputs. It then seemed to behave very erratically or stopped doing anything. I originally thought that this was down to the +6V, but it was the same at 0V. I've solved the problem (for now) by replacing the the transistor circuit with a diode and 1K0 resistor in series to pin 3 of the 4006 and a 100K pull-down resistor between pin 3 and 0V. Any idea of why this could be happening? Also, I'm interested to find out why you put transistors on these clock inputs. I'm sure there's a good reason for it, but I don't know the answer!

Gary

4053 Hex SPDT Switch (Rev 1.1).gif

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PHOBoS · Posted: Thu Apr 11, 2013 10:03 am Post subject: Re: Updated Schematic

analog_backlash · Posted: Thu Apr 11, 2013 4:07 pm Post subject:

Thanks for that PHOBoS - that seems to make a lot of sense. I might add alternative inputs/outputs (via capacitors) for audio signals. I haven't really got around to trying out non-digital sources yet, I was just trying to think ahead for possible future apps.

I'm not too worried about the transistor problem at the moment, as I seem to have got it working OK without it. I'll think about it another time Very Happy

Gary

nathanxl · Joined: Apr 24, 2012 Posts: 77 Location: Wa

Hi.
I have a need to switch 2 inputs out to one output from a gate trigger.
Say two different oscillators that alternate at the output to a single channel on a mixer when the gate trigger is high/low respectively.

Is this circuit what I need?
Cant really get my head around what is happening in the schem... Basically because Im stuupid.

Can some one dumb it down for me and explain what I need?

PHOBoS · Posted: Sat Sep 07, 2013 6:42 am Post subject:

nathanxl · Joined: Apr 24, 2012 Posts: 77 Location: Wa

analog_backlash · Posted: Sat Sep 07, 2013 8:14 am Post subject:

Thanks for replying PHOBoS - it saved me having to think too much!!! I was also thinking along the lines of using 4066s - I'm still not completely sure why this wouldn't work for your application nathanxl (probably I'm very stupid as well). The MAX394 does seem to do a similar job to the 4053 that I used (but the 4053 is far cheaper). Also, I wonder how easy the MAX394 is to get - I haven't found a UK source yet, but the US may be different. I have found the DG307 which might also be applicable (maybe):

http://www.farnell.com/datasheets/87592.pdf

Perhaps PHOBoS will have a better grasp on this (almost certainly, in fact).

Gary

PHOBoS · Posted: Sat Sep 07, 2013 9:50 am Post subject:

yes, you could also do it with a 4053 (4066 was just the first thing that came to mind). So I've drawn 2 schematics:
one using a 4066 and a transistor as in inverter, the other one using a 4053 which doesn't need in inverter.
It also has one spare switch (if you use it for stereo signals) which you could use for some indicator LED's.

you can find some more info on the biasing for analog signals here

note: for the 4066 version a high gate will select input 1, for the 4053 version a high gate will select input 2. (can be changed of course)

dual analog switch (4066).gif

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dual [analog] switch using a CD4066

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dual [analog] switch using a CD4053

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analog_backlash · Posted: Sat Sep 07, 2013 3:54 pm Post subject:

Thanks again for that PHOBoS Very Happy

. The biasing link looks really useful too. I've not done much lunettaring lately as I've been going off on several different tangents (and I've been a bit pissed off, to tell the truth - nothing to do with electronics, just life in general Crying or Very sad

). Anyway, I've got myself going again and one of the many things I wanted to try (eventually) was to put audio signals through the 4053 circuit. This should be of great help.

Gary

nathanxl · Joined: Apr 24, 2012 Posts: 77 Location: Wa

Thankyou so much Master Phobos.
I will breadboard these and report back.

Thankyou.
N

PHOBoS · Posted: Sun Dec 21, 2014 7:25 pm Post subject: Fairground Nightmare Maniac remix

I posted a remix of Fairground Nightmare here. Cool