Electronic Bypass
- mictester
- Old Solderhand
Information
Juanro
Your circuit is correct. You have to remember that there's some series resistance present when a CMOS switch is "on" - the 4066 is about 60 ohms, and the 4016 is about 600 ohms. Adding the series resistor to the shunt path isn't completely necessary, but is probably good practice if using a 4066.
Incidentally, the LEDs I use are the three-terminal (common anode) type, which look pretty good when they change colour!
Your circuit is correct. You have to remember that there's some series resistance present when a CMOS switch is "on" - the 4066 is about 60 ohms, and the 4016 is about 600 ohms. Adding the series resistor to the shunt path isn't completely necessary, but is probably good practice if using a 4066.
Incidentally, the LEDs I use are the three-terminal (common anode) type, which look pretty good when they change colour!
"Why is it humming?" "Because it doesn't know the words!"
- meffcio
- Solder Soldier
This is known to work. The PDF contains a SMD version, the archive - non-smd, but the schematic is the same in both of them.
- Attachments
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- stopa_ver1.zip
- (632.84 KiB) Downloaded 174 times
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- stopa.pdf
- (533.06 KiB) Downloaded 205 times
- earthtonesaudio
- Transistor Tuner
I really like that SMD implementation, meffcio. However it only uses series switches which makes it a bit different from Mictester's.
Here is an adaptation of Mictester's idea. I did not like how the output of the buffer was switched to Vref through its output cap. Sure, the components can handle that current spike, but it's a current spike we would rather not have at all. So I came up with this version which does the job better (in my opinion) with a single component change. Swap the 4066 for a 4053 and reroute. Note that only one control line is required because the 4053 can be operated as either normally-open or normally-closed. Also I did not include the LED or Vref housekeeping details but they could be added easily. Finally I used a *latching* mechanical SPST switch like in Mictester's original.
Link to simulation here.
Here is an adaptation of Mictester's idea. I did not like how the output of the buffer was switched to Vref through its output cap. Sure, the components can handle that current spike, but it's a current spike we would rather not have at all. So I came up with this version which does the job better (in my opinion) with a single component change. Swap the 4066 for a 4053 and reroute. Note that only one control line is required because the 4053 can be operated as either normally-open or normally-closed. Also I did not include the LED or Vref housekeeping details but they could be added easily. Finally I used a *latching* mechanical SPST switch like in Mictester's original.
Link to simulation here.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- earthtonesaudio
- Transistor Tuner
...And another one using a momentary switch and a couple other mods. The primary difference is shunting the effect send during bypass. I figured this might be more effective at preventing bleed of the effected signal. Sim
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- juanro
- Cap Cooler
Hi,
I made the PCB for the (almost) original circuit mictester posted (See my previuos schematic for part numbers, and mictester's for values). Attached is RAR file with ExpressPCB schematic and layout.
Let me know what you think or if you find any errors.
Regards,
Juanro
I made the PCB for the (almost) original circuit mictester posted (See my previuos schematic for part numbers, and mictester's for values). Attached is RAR file with ExpressPCB schematic and layout.
Let me know what you think or if you find any errors.
Regards,
Juanro
La única verdad es la realidad.
- mictester
- Old Solderhand
Information
That's a really good layout. I'll put a Vero version up later.
"Why is it humming?" "Because it doesn't know the words!"
- HEAD
- Resistor Ronker
Did somebody came up with a layout for this?earthtonesaudio wrote:I really like that SMD implementation, meffcio. However it only uses series switches which makes it a bit different from Mictester's.
Here is an adaptation of Mictester's idea. I did not like how the output of the buffer was switched to Vref through its output cap. Sure, the components can handle that current spike, but it's a current spike we would rather not have at all. So I came up with this version which does the job better (in my opinion) with a single component change. Swap the 4066 for a 4053 and reroute. Note that only one control line is required because the 4053 can be operated as either normally-open or normally-closed. Also I did not include the LED or Vref housekeeping details but they could be added easily. Finally I used a *latching* mechanical SPST switch like in Mictester's original.
Link to simulation here.
- grrrunge
- Diode Debunker
Information
I am really looking forward to this onemictester wrote:That's a really good layout. I'll put a Vero version up later.
A true believer in the magic of Sherwood Forest Pedal Pirates
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- Barcode
- Diode Debunker
There is a layout posted in the post RIGHT before yours...HEAD wrote:Did somebody came up with a layout for this?earthtonesaudio wrote:I really like that SMD implementation, meffcio. However it only uses series switches which makes it a bit different from Mictester's.
Here is an adaptation of Mictester's idea. I did not like how the output of the buffer was switched to Vref through its output cap. Sure, the components can handle that current spike, but it's a current spike we would rather not have at all. So I came up with this version which does the job better (in my opinion) with a single component change. Swap the 4066 for a 4053 and reroute. Note that only one control line is required because the 4053 can be operated as either normally-open or normally-closed. Also I did not include the LED or Vref housekeeping details but they could be added easily. Finally I used a *latching* mechanical SPST switch like in Mictester's original.
Link to simulation here.
- HEAD
- Resistor Ronker
Sorry, did quote the wrong post. I meant a layout to this one here: SimBarcode wrote:There is a layout posted in the post RIGHT before yours...HEAD wrote:Did somebody came up with a layout for this?earthtonesaudio wrote:I really like that SMD implementation, meffcio. However it only uses series switches which makes it a bit different from Mictester's.
Here is an adaptation of Mictester's idea. I did not like how the output of the buffer was switched to Vref through its output cap. Sure, the components can handle that current spike, but it's a current spike we would rather not have at all. So I came up with this version which does the job better (in my opinion) with a single component change. Swap the 4066 for a 4053 and reroute. Note that only one control line is required because the 4053 can be operated as either normally-open or normally-closed. Also I did not include the LED or Vref housekeeping details but they could be added easily. Finally I used a *latching* mechanical SPST switch like in Mictester's original.
Link to simulation here.
But otherwise than this mistake I personaly think that a layout to a slightly different schematic with no parts values mentioned is a pain in the **** to work with. Swapping always from one schematic to the other and comparing is... naaaaaaaaarf!
- earthtonesaudio
- Transistor Tuner
I need more practice doing layouts... I'll try to find some time to produce one for the 4053/555 version.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- juanro
- Cap Cooler
Hey,
Sorry, I attached the schematic too (in the rar file). There are no part values (I think) but there aren't so many parts... If I have some time over the weekend I'll take a look over and post a completed version.
Juanro
Sorry, I attached the schematic too (in the rar file). There are no part values (I think) but there aren't so many parts... If I have some time over the weekend I'll take a look over and post a completed version.
Juanro
La única verdad es la realidad.
- juanro
- Cap Cooler
Attached RAR file with ExpressPCB schematic and layout, now with part values.
Any comment or error please let me know.
Juanro
Any comment or error please let me know.
Juanro
- Attachments
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- electronic_bypass.rar
- (35.92 KiB) Downloaded 171 times
La única verdad es la realidad.
- HEAD
- Resistor Ronker
juanro wrote:Attached RAR file with ExpressPCB schematic and layout, now with part values.
Any comment or error please let me know.
Juanro
Thanks, Juanro! Had some spare time I tried your layout - though I had to reroute it in Sprint Layout as I always don't like the vias of Express PCB and I wanted to use 5,04mm Cs. Furthermore I left out the in fx_in and fx_out caps as most effects already have them at their in and outs. Sadfully I get some serious popping while switching betwenn fx and bypass. Did I miss a pulldown-r?
- earthtonesaudio
- Transistor Tuner
I can't open the .rar file from here but I would imagine coupling caps are required to bias the switch IC... Maybe that's it.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- juanro
- Cap Cooler
Hi,
Are you using this fixed within an FX box or are you using it as a standalone bypassing? Does it pops even when not connecting the fx in & out?
If your fx circuit have C's at their in & out, does it also have pulldown R? If so, you're pulling the biased points (U1 - pin 7 and/or U2 - pin 3) to ground.
Also check that all IN/OUT pins of the 4066 (1,2,3,4,8,9,10,11) have exactly the same potencial (roughly Vcc/2)
Just in case try it with in/out caps and further pulldown R to ground
Hope that helps, let me know.
Juanro
Are you using this fixed within an FX box or are you using it as a standalone bypassing? Does it pops even when not connecting the fx in & out?
If your fx circuit have C's at their in & out, does it also have pulldown R? If so, you're pulling the biased points (U1 - pin 7 and/or U2 - pin 3) to ground.
Also check that all IN/OUT pins of the 4066 (1,2,3,4,8,9,10,11) have exactly the same potencial (roughly Vcc/2)
Just in case try it with in/out caps and further pulldown R to ground
Hope that helps, let me know.
Juanro
La única verdad es la realidad.
- juanro
- Cap Cooler
BTW: I used a .rar because it seemed to me that it was the most universal file format... culturejam err, sorry: earthtonesaudio, is there any other prefered file format?
Juanro
Juanro
La única verdad es la realidad.
- HEAD
- Resistor Ronker
juanro wrote:Hi,
Are you using this fixed within an FX box or are you using it as a standalone bypassing? Does it pops even when not connecting the fx in & out?
If your fx circuit have C's at their in & out, does it also have pulldown R? If so, you're pulling the biased points (U1 - pin 7 and/or U2 - pin 3) to ground.
Also check that all IN/OUT pins of the 4066 (1,2,3,4,8,9,10,11) have exactly the same potencial (roughly Vcc/2)
Just in case try it with in/out caps and further pulldown R to ground
Hope that helps, let me know.
Juanro
With nothing connected to fx in and out it pops everytime I switch back to bypassed status. Adding the in and out caps does fix the "in pop" but there's still some popping if switching back to bypass. As I'm using it as a bypass standalone for experimenting purposes the effects in put into its "loop" of course have a pulldown-r at their input and with their own volume controll acting as a pulldown at the output. Gonna check the voltages later this evening.