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nbveh
Joined: Aug 02, 2009
Posts: 3
Location: Berlin
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 Posted: Tue Mar 02, 2010 6:49 am Post subject:
Bass++ with 9volt battery,is it possible?
Subject description: conversion of circuit design |
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Hello.
I believe it's my first post in this forum, so be hard on me)
I have some experience with building circuits, but it is more practical than theoretical, i can replicate something i see, but this time looks like i need something more than monkeying skills...
What i want to do is to built neat little drum synth module working from 9 volt battery so i can take it next to mine battery-powered synths, i appreciate modular systems a lot but feel more like working with small forms...
I have asked our tutor who giving course on electronics(studying in art school, but everybody using Arduinos and all that nowadays....) and he wrote me this:
| Quote: | I think the circuit should be "fine" on +9V, with some caveats:
1. Some of the calculations of resistor values are likely based on using +15/-15V. You may need to tune some resistor values.
2. It could be useful to create a "virtual" +4.5/-4.5/GND power supply. When you use +9V, you just need to create a virtual ground at 4.5V. (http://experimentalistsanonymous.com/board/forums.html?topic=1739.0). The schematic for splitting the input voltage by two using two resistors as a voltage-divider and an Op-Amp as buffer is a simple way to create a reliable virtual "Ground" at +4.5V. You would then have the following mapping: +9V (real power supply) ==> +4.5V (virtual power supply), 0V (real power supply) ==> -4.5V (virtual power supply), and +4.5V (real power supply) ==> 0V (virtual power supply).
All this "real" and "virtual" talk is just two ways of looking at the same thing. In audio circuits, it's often useful to have a mental picture of a power supply that goes above ground and below ground, since that's what the audio signal is doing. |
Problem is i'm note sure why should i use these "virtual" thingis at all... as i said already, i can make something but without real understanding how it working...for example i've bult VCO based on XR VCO schematics, but working from 9 volt battery and with control voltages going out of atmel chip(with Arduino bootloader on it) and it works fine without any virtual solutions....jst low and high pass filters in appropriate places...
Well, hope u'll like the idea transforming another monkey into human being with help of ur valuable advices...
And yes, i don't want to be" sorry for my bEd Englisch" but since i'm not native speaker, be hard on me another time)
Thanks! |
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kkissinger
Joined: Mar 28, 2006
Posts: 1192
Location: Kansas City, Mo USA
Audio files: 27
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| Posted: Tue Mar 02, 2010 7:24 am Post subject:
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If space permits, you might consider powering your module from a pair of 9v batteries. You would connect the batteries in series and the junction of the batteries would be your ground and you would have +9 and -9 at the ends. This would give you more voltage to play with.
_________________
-- Kevin
http://kevinkissinger.com |
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nbveh
Joined: Aug 02, 2009
Posts: 3
Location: Berlin
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jordroid
Joined: Jan 17, 2010
Posts: 193
Location: ithaca, new york
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| Posted: Tue Mar 02, 2010 1:55 pm Post subject:
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That link didn't work for me, but it sounds like the good old R.G. Keen charge pump http://www.geofex.com/ navigate to "circuit sweepings" then "+9V *and* -9V from one battery!"
If you have the space for two nine volts it is probably a better solution, as the charge pump method drains the single battery twice as fast, and it can really eat through them quickly.
-edit- whoops, the link works fine now, don't know why i couldn't view it before. The geofex article may still be interesting though. |
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