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e1999
Joined: Apr 25, 2019 Posts: 29 Location: naples
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PHOBoS
Joined: Jan 14, 2010 Posts: 5603 Location: Moon Base
Audio files: 705
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Posted: Wed Mar 18, 2020 5:15 pm Post subject:
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Not sure if it's just some errors in the schematic or you left some things out but let's see:
- The reset pin of the 4017 doesn't need a pulldown resistor if it is directly connected to one of the outputs. It doesn't hurt though.
- CLK EN (pin 13) of the 4017 can be directly connected to GND.
- on Q1 (pin2 ) of the 4017 the resistor and output of the touchsensor are connected on the wrong side of the diode.
- the unused inputs of the 4532 should be connected but I am guessing you only drew 2 channels and you have more outputs of the 4017 + touch sensors connected to them.
- leave out the diodes connected between the 4051 and the pots.
- add current limiting resistors to the LEDs.
- add a pulldown resistor to your output jack, although there is probably a resistor on the input of whatever you connect it to. It would also be wise to buffer this output.
Do you only have 10V or is this derived from a bipolar 12V/15V supply ?
I only had a quick look but might have a better look at it this weekend. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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e1999
Joined: Apr 25, 2019 Posts: 29 Location: naples
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PHOBoS
Joined: Jan 14, 2010 Posts: 5603 Location: Moon Base
Audio files: 705
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Posted: Thu Mar 26, 2020 9:02 am Post subject:
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Daisy chaining the ground shouldn't be a problem, unless you use a very thin cable, since the current is low to begin with.
However it would be best to use a seperate cable for the LEDs. Also make sure the current through the LEDs is low since it will pull down the voltage,
using 10K resistors should work ok.
I don't think there is a need to use the Eout of the 4532 because one output of the 4017 will always be high and therefor the Eout should always be low
So I think you could just connect the INH pin of the 4051 directly to GND. I think there is anther chip that might be better to use here than the 4051,
let me see if I can find it. OK I think it is the CD4028 which isn't a mux but a decoder, no idea is it easy to get though. You could also try it without the
LEDs or use a seperate 4051 to drive those.
Non inverting buffer should work but power it by 12V otherwise you will probably not get a 10V output. Oh and you need a resistor to GND after the diodes
before the opamp but it might work ok with the LM358 as I believe it has some internal biasing.
Inverting the outputs of the 4532 wil indeed reverse the direction and if you use XOR gates you can toggle the direction. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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e1999
Joined: Apr 25, 2019 Posts: 29 Location: naples
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Posted: Sun Mar 29, 2020 6:06 am Post subject:
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Ok thanks:)
Wish that I could get this to work a bit more smoothly as the 4532 to 4051 combo opens up a lot of possibilities not present on a 4017 by itself....
I think the triggering back to the first step is something that has to do with maybe the inhibit but also the individual stages since it is only happening on 3 of the steps. I went back in and resoldered the connections for those steps but still no dice.
Thanks for the recommendation of the cd4028. I would like to try and get this working with 4051 because there are certain situations where I don't want it to output cv if no touch sensor is activated. But I'm sure that chip could be useful for something in the future:) |
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