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inverseroom
Joined: May 15, 2005
Posts: 1
Location: wherever
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 Posted: Sun May 15, 2005 7:16 am Post subject:
Using a Wall Wart, and capacitor equivalents |
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Hi there--
I tried emailing Ray, but it came back. Perhaps you all can help me. My Mini-Synth is coming along great; however, I have a couple of questions...
1) I think I'm going to just use a wall-wart and power conditioner instead of batteries, or perhaps in addition to them. Should it be 9v or 18v?
2) C1 is listed as .001uf. C8 and C9 are listed as 1000pf. Aren't these the same thing, the caps marked 102? I just used the same part in each place, correct me if I'm wrong about it.
Thanks, y'all...
John. |
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radfaraf
Joined: May 02, 2005
Posts: 18
Location: USA
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| Posted: Sun May 15, 2005 11:59 am Post subject:
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According to my math C8 and C9 are the same too.  |
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dnny
Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8
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| Posted: Sun May 15, 2005 1:20 pm Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| inverseroom wrote: | Hi there--
1) I think I'm going to just use a wall-wart and power conditioner instead of batteries, or perhaps in addition to them. Should it be 9v or 18v?
2) C1 is listed as .001uf. C8 and C9 are listed as 1000pf. Aren't these the same thing, the caps marked 102? I just used the same part in each place, correct me if I'm wrong about it |
the power supply should be +/-9v
| Ray wrote: | | I recommend that you don't apply voltage greater than 9 volts to the inputs or you may damage the components. |
i dont know if you can make +/- 9V psu by hooking up two +9v transformers as shown Here
if someone knows please tell us.
the capacitors are the same. so no need to change those
nice conversions table pikos,nanos,micros and so on:
http://www.sengpielaudio.com/ConvPrefe.htm
daniel |
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ladislaobiro
Joined: Mar 24, 2005
Posts: 105
Location: Italy
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| Posted: Mon May 16, 2005 8:50 am Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| inverseroom wrote: | | 1) I think I'm going to just use a wall-wart and power conditioner instead of batteries, or perhaps in addition to them. Should it be 9v or 18v? |
as dnny told you the PS should be +/-9V, but a +/-12V PS will work just fine as Ray told me. You can find the schematic and the PCB here.
| dnny wrote: |
the power supply should be +/-9v
| Ray wrote: | | I recommend that you don't apply voltage greater than 9 volts to the inputs or you may damage the components. |
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probably Ray was meaning CV inputs for VCO's, VCF's, an so on... but to power up your synth +/-12V PS will be just fine.
ladislao |
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lanxe
Joined: Feb 24, 2005
Posts: 102
Location: Columbus, OH - Now Carson City NV
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| Posted: Sun May 22, 2005 6:20 pm Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| inverseroom wrote: | Hi there--
I tried emailing Ray, but it came back. Perhaps you all can help me. My Mini-Synth is coming along great; however, I have a couple of questions...
1) I think I'm going to just use a wall-wart and power conditioner instead of batteries, or perhaps in addition to them. Should it be 9v or 18v?
2) C1 is listed as .001uf. C8 and C9 are listed as 1000pf. Aren't these the same thing, the caps marked 102? I just used the same part in each place, correct me if I'm wrong about it.
Thanks, y'all...
John. |
you can use a regular 9v wall wart but you have to add this circuit to get the +/- 9V needed.
its just one chip as shown here:
http://www.geofex.com/circuits/+9_to_-9.htm
its a pretty simple circuit that works pretty well.
Ryan Bocook |
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dnny
Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8
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| Posted: Tue Jul 19, 2005 7:14 am Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| lanxe wrote: |
you can use a regular 9v wall wart but you have to add this circuit to get the +/- 9V needed.
its just one chip as shown here:
http://www.geofex.com/circuits/+9_to_-9.htm
its a pretty simple circuit that works pretty well.
Ryan Bocook |
that chip is hard to find at least here in Finland
- so here is an alternative schematic. it uses two CMOS hex inverters (74HC04). the maximum output current is 10mA so its perfect for Sound Lab as the SL draws well under 10 mA
Get negative rail using CMOS gates
hope this helps someone
daniel |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Wed Jul 20, 2005 10:00 pm Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| Quote: | | the maximum output current is 10mA so its perfect for Sound Lab as the SL draws well under 10 mA |
Hmm last time I checked mine pulled a (comparatively) whopping 35mA. Guess something is definitely wrong with mine... |
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dnny
Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
Audio files: 8
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| Posted: Thu Jul 21, 2005 12:36 am Post subject:
Re: Using a Wall Wart, and capacitor equivalents |
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| Etaoin wrote: | | Quote: | | the maximum output current is 10mA so its perfect for Sound Lab as the SL draws well under 10 mA |
Hmm last time I checked mine pulled a (comparatively) whopping 35mA. Guess something is definitely wrong with mine... |
hmm... any LEDs you are using ?
have you moded yours ? |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Thu Jul 21, 2005 12:44 am Post subject:
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One LED on the LFO. No other mods.
But I also experience drops in the +9V of about 20 mV over an LFO cycle (see my 'LFO bleeding into noise generator' thread on this forum).
There's definitely something wrong with my Soundlab, but I can't for the life of me find what it is, which is a pity, since the Soundlab has now been sitting unused on a shelf for weeks after I gave up finding what's wrong with it. |
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Wild Zebra
Joined: Apr 28, 2005
Posts: 806
Location: Ohio
Audio files: 5
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| Posted: Thu Jul 21, 2005 7:36 am Post subject:
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So you never figured it out. I was wondering. I unhooked the led for my LFO because even if it wasn't patched it sounded like the LFO was on.
I think because of the voltage the LED was drawing. When I unhooked it it worked fine. I heard of using a buffer and seperate power supply haven't gone that route yet.
_________________
"your stripes are killer bro" |
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