Battery Simulator

[Bricksnbeatles]

There was one in the old wishlist with the gigrig virtual battery. https://forum.pedalpcb.com/threads/gigrig-virtual-battery.6630/

Supposedly simulates the properties of a 9v battery better more than just a series resistance.
I was able to track down a readily available identical spec dc-dc converter, but I’ll have to find it again in my notes.

 

[Robert]

Point me to the DC/DC converter when you find it.

I have a few of these projects in my WIP folder but was waiting until I could find a reasonably priced converter.

 

[Bricksnbeatles]

Point me to the DC/DC converter when you find it.

I have a few of these projects in my WIP folder but was waiting until I could find a reasonably priced converter.

$5 and readily available. It took a bit of sleuthing, but it seems that this is the same identical specs to the one gigrig uses, just in a different footprint.

https://www.mouser.com/ProductDetail/CUI-Inc/PDM1-S9-D9-S?qs=BA62vJVifGrECTi94diWlw%3D%3D

 

[Robert]

I tell ya, the Gig Rig Virtual Battery just looks like a 10R resistor in series with a 200R trim pot.

I don't see where the DC/DC converter would contribute anything other than isolation for positive ground effects.

 

[Robert]

Why the long face? I didn't mean I wouldn't do it.

 

[Big Monk]

There is a lot of great documentation out there about REAL battery simulators.

If I remember correctly, it's about more than just voltage.

 

[Big Monk]

I had a whole folder on battery simulation and it looks like i delete it. Let me see if I can did it up.

 

[Bricksnbeatles]

Why the long face? I didn't mean I wouldn't do it.

the long face is that there's not more going on in it than just the resistor and trimmer. As Monk said, there's a lot more to real battery simulation, and this isn't that. I thought there was probably a bit more that wasn't really visible on the board in the pics from the original thread, but it seems that's not so

 

[Big Monk]

the long face is that there's not more going on in it than just the resistor and trimmer. As Monk said, there's a lot more to real battery simulation, and this isn't that. I thought there was probably a bit more that wasn't really visible on the board in the pics from the original thread, but it seems that's not so

I'll say this: By the time you TRULY simulate a battery, you may as well be using a power supply.

I'm not shitting you. It gets very intensive, very quick.

 

[Feral Feline]

QUICK, ROBBIN', TO THE DEAD-BATT SIM!

Good Ol' Beavis showed a variety of ways to implement it:
- Series resistance
- Voltage divider
- with a meter
- standalone (plug almost any effect into it)
- within a build (starving just one component instead of the entire circuit, which is not germane here)

Alas, the "DEVOLT" is not on the new Beavis site, but I can send the doc I have to anybody that wants it.
[EDIT: found it on the Internet WayBack Machine HERE]

Lots of Deadbatt on the usual suspect forums... and elsewhere. Search the interwebs



As an aside...

SAG, STARVE, BIAS, OH MY!



From a Talkbass thread…


SSB PEDALS, the following list lends itself well as to why one might want such a device as a deadbatt-sim:

- Analog Man Peppermint Fuzz

- Analog Man Sunfaces

- Blackout Effectors Fubar

- Copilot Terra Fuzz

- Devi Ever Soda Meiser

- Devi Ever War Horse

- Dwarfcraft Defiance

- Dwarfcraft Great Destroyer

- Dwarfcraft Hax

- Dwarfcraft Necromancer

- Dwarfcraft Robot Devil

- Dwarfcraft SheFuzz

- Dwarfcraft Shiva

- Dwarfcraft Silver Rose

- Durham Crazy Horse

- EHX Germanium OD

- EHX Germanium Big Muff

- EQD Dirt Transmitter

- Fairfield Barbershop

- Fulltone '69

- Fuzzhugger Algal Bloom

- Fuzzrocious Ram The Manparts

- Guttermouth modded EHX/Sovtek Big Muff

- Hartman Vintage Germanium Fuzz (internal bias trimmer)

- Heavy Electronics Grind Fuzz

- JHS Firefly

- Lovepedal Dragon (internal trimmer)

- Lovepedal BBB Fuzz

- Lovepedal COT 50

- Marrs Pedals Fuzz Light Year

- McSpunkle Gnomeratron

- Menatone Top Boost In A Box (8-knob version included a "sag" knob)

- MI Audio Neo Fuzz

- Mojo Hand FX El Guapo

- Monsterpiece GE Fuzz

- Monsterpiece Mk III

- Monsterpiece Scratchy Snatch

- Penny Pedals Fingerprint

- Penny Pedals Low Fuzz

- Recovery Sound Destruction Device

- SS/BS Buzzz

- SS/BS Mini

- SS/BS TAFM

- Southampton Fifth Gear

- Subdecay Flying Tomato

- VFE Fiery Red Horse fuzz

- Wren & Cuff Phat Phuk B

- Xotic XW-1 (has a "Bias" control)

- Zvex Fuzz Factory




VOLTAGE REGULATORS

- Alchemy Audio's "Dead Bat"

- Beavis Audio's DIY dying battery simulator [WAYBACK MACHINE: https://web.archive.org/web/20150205191822/http://www.beavisaudio.com/Projects/DBS/#close]

- Danelectro's "Danelectrode"

- Dwarfcraft Power Struggle

- Gig Rig's Virtual Battery

- Mantra Devolter

- Marrs Pedals De-Voltaire




PSUs

- ADL Juice Box

- MXR Iso-Brick

- Truetone One Spot Pro CS 12

- Voodoo Lab's Pedal Power 2 Plus











As TBer JasonMitsch noted, these sag/starve type devices won't work well with digital pedals. Some Digi-pedals will behave erratically when voltage starved; Most digital pedals won't work at all without the specified voltage they demand; and in some cases you may even damage a digital pedal (maybe, I don't know).





The Xotic Wah has a bias control...

 

[Elijah-Baley]

Do you interest this?
Gig Rig Virtual Battery gutsthot. Found somewhere.

 

[Robert]

Oh cool, they're using the Recom now.

 

[Big Monk]

What I do t get about battery simulation is that by the time you do it right, it’s basically a power supply…

 

[ICTRock]

 

[Feral Feline]

"Well, Robert'd better have those dead-batt units in the Utility Page prepared by mid-Oct, or there'll be hell to pay."

 

[Big Monk]

Here is the great write up from AMZ:

Patents on Parade 2

This patent is an example of how the patent office cannot search all relevant publications on a topic before granting a patent.

www.muzique.com

I tracked down The Stompbox Cookbook from somewhere but can’t find it.

To my earlier point though, when truly simulating a battery looks like this, a 9v tap from a power supply starts to look pretty good:



A better option might just be a bias pot that allows you starved power settings.

 

[Robert]

To my earlier point though, when truly simulating a battery looks like this, a 9v tap from a power supply starts to look pretty good:

A better option might just be a bias pot that allows you starved power settings.

Or a battery...

 

[Robert]

I kid really. We could shrink that circuit down with some SMD components.

I managed to squeeze an entire charge pump voltage doubler down to the footprint of a single SOIC-8 SMD IC.

IC on one side, passives on the back.

 

[finebyfine]

Not sure if I’m missing something but 5K is too high for R1 there unless the point is for 9V to be closer to noon (and even then it’s still too high). 2K is what I’ve used with an LM317 for 1.5V-9V with Vout = 1.25 * (1 + R2 / R1)

 

[Bricksnbeatles]

Not sure if I’m missing something but 5K is too high for R1 there unless the point is for 9V to be closer to noon (and even then it’s still too high). 2K is what I’ve used with an LM317 for 1.5V-9V with Vout = 1.25 * (1 + R2 / R1)

Yeah, 1.5k would get you 9v. 5k tops out at 27v there.