Walrus Audio - Mayflower [traced]
- mmolteratx
- Degoop Doctor
Just realized I accidentally placed the +9V tap at the +4.5V tap. Anyone reading it should realize the error pretty quickly.
- mmolteratx
- Degoop Doctor
Here's the schem for anyone who wants to fix it. Not worth anymore effort though, IMO.
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Mayflower.sch
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- Jack Deville
- Resistor Ronker
Information
Here are some reasons to use a follower for a reference supply:
-Its stiff. Really stiff, without sacrificing current consumption due to low value resistors.
-Higher value resistors can be used, since the follower is doing the heavy lifting. That can mean lower current consumption (a balance between what the follower draws and what the simple divider draws).
-Higher value resistors mean lower value capacitors, which in this case have been negated. Don't ask why. I didn't design it.
-Its isolated from the rails. This means you can slam it with (relatively) huge signals and currents without causing the same disruptions in other sections of the circuit. There are limitations here, of course...
-A closer approximation to linear operation can be achieved as a result of the isolation. Think about it. You'll see it.
-Its confusing! Makes people stop and ask why, and anytime that happens, I'd say you've got a winner on your hands.

-Its stiff. Really stiff, without sacrificing current consumption due to low value resistors.
-Higher value resistors can be used, since the follower is doing the heavy lifting. That can mean lower current consumption (a balance between what the follower draws and what the simple divider draws).
-Higher value resistors mean lower value capacitors, which in this case have been negated. Don't ask why. I didn't design it.
-Its isolated from the rails. This means you can slam it with (relatively) huge signals and currents without causing the same disruptions in other sections of the circuit. There are limitations here, of course...
-A closer approximation to linear operation can be achieved as a result of the isolation. Think about it. You'll see it.
-Its confusing! Makes people stop and ask why, and anytime that happens, I'd say you've got a winner on your hands.

- mmolteratx
- Degoop Doctor
Low impedance out too, so less susceptible to external noise interference, and less voltage drop under operation. I use them on occasion when I need a bias supply for several devices.
- newly
- Breadboard Brother
So all "+9V" should connected to "V+" instead right? VB remain as 4.5V.mmolteratx wrote:Just realized I accidentally placed the +9V tap at the +4.5V tap. Anyone reading it should realize the error pretty quickly.
- grrrunge
- Diode Debunker
Information
Thanks for the informative reply!Jack Deville wrote:Here are some reasons to use a follower for a reference supply:
-Its stiff. Really stiff, without sacrificing current consumption due to low value resistors.
-Higher value resistors can be used, since the follower is doing the heavy lifting. That can mean lower current consumption (a balance between what the follower draws and what the simple divider draws).
-Higher value resistors mean lower value capacitors, which in this case have been negated. Don't ask why. I didn't design it.
-Its isolated from the rails. This means you can slam it with (relatively) huge signals and currents without causing the same disruptions in other sections of the circuit. There are limitations here, of course...
-A closer approximation to linear operation can be achieved as a result of the isolation. Think about it. You'll see it.
-Its confusing! Makes people stop and ask why, and anytime that happens, I'd say you've got a winner on your hands.

A true believer in the magic of Sherwood Forest Pedal Pirates
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New base of operations: http://www.knucklehead.dk
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New base of operations: http://www.knucklehead.dk
- mmolteratx
- Degoop Doctor
Yes.newly wrote:So all "+9V" should connected to "V+" instead right? VB remain as 4.5V.mmolteratx wrote:Just realized I accidentally placed the +9V tap at the +4.5V tap. Anyone reading it should realize the error pretty quickly.
- mmolteratx
- Degoop Doctor
- IvIark
- Tube Twister
Information
Here's the vero

and one with a standard voltage divider for vref, doing away with the second opamp. I'm not convinced it will make a difference in something like this, and so would prefer to save the space.


and one with a standard voltage divider for vref, doing away with the second opamp. I'm not convinced it will make a difference in something like this, and so would prefer to save the space.

"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- 287m
- Breadboard Brother
hey Miles
You can make a quick and dirty 1u nonpolar wannabe capacitor by tying together the negatives of 2 1u electro
then solder positive leg to board
You can make a quick and dirty 1u nonpolar wannabe capacitor by tying together the negatives of 2 1u electro
then solder positive leg to board
- Blitz Krieg
- Breadboard Brother
^^^^ 2 uf?
- grrrunge
- Diode Debunker
Information
No! Capacitances in series adds up like resistances do in parallel. 2*1µF in series would effectively give you 0.5µF.287m wrote:hey Miles
You can make a quick and dirty 1u nonpolar wannabe capacitor by tying together the negatives of 2 1u electro
then solder positive leg to board
To get 1µF you'll need two 2µF caps in series

A true believer in the magic of Sherwood Forest Pedal Pirates
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New base of operations: http://www.knucklehead.dk
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New base of operations: http://www.knucklehead.dk
- mictester
- Old Solderhand
Information
C7 into the volume pot has a -3dB point of 16Hz! You could easily use 470n for the 1u caps in the audio path with no significant change in the (audible) frequency response. You could put two 470n caps in parallel for the "Bass" cap....
"Why is it humming?" "Because it doesn't know the words!"
- 287m
- Breadboard Brother
no, two 1 uF polarized (+-) wired in series like +--+ , still 1uFBlitz Krieg wrote:^^^^ 2 uf?
normally, you right.grrrunge wrote:No! Capacitances in series adds up like resistances do in parallel. 2*1µF in series would effectively give you 0.5µF.287m wrote:hey Miles
You can make a quick and dirty 1u nonpolar wannabe capacitor by tying together the negatives of 2 1u electro
then solder positive leg to board
To get 1µF you'll need two 2µF caps in series
normal elco actually conduct in the reverse direction, two 1uF polarized act like they each have a diode in parallel with them that conducts when the voltage is backwards for that one cap.
- grrrunge
- Diode Debunker
Information
Where did you learn that? I have never seen any diodes in the equivalent diagram for electrolytics. Only capacitance, inductance and resistances.
As far as i know, the only reason electrolytics are polarised devices, is because improper DC-bias will break down the dielectric layer.
As far as i know, the only reason electrolytics are polarised devices, is because improper DC-bias will break down the dielectric layer.
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
---
New base of operations: http://www.knucklehead.dk