Cgs synth

Hi,

the Tube VCA is built, but it sounds to low,
and finally it sounds as it has an HP-filter in the Audio path.
( i used the 1SH24B Tube )

while building, there where some things not clear:
The Bridge beside the Tube: i made the shorter one
And the 330k Resistor vs. ???. It's written: one or other. I put the
330K in there.

The 220N Caps under the Tubes are Ceramic as i had no others.
If this matters i can change them later

It's my only module that not work.
and im so curious to hear it ;)


hope you have an Idea where to search.


(Electronic things i allways solder proper, and i recognize my faults
allways while building, as i control the things.
the inputfaders ( instead of pots) where soldered wrong, thats
alltready corrected.)

thanks in advance,
H.C.

>while building, there where some things not clear:
>The Bridge beside the Tube: i made the shorter one
>And the 330k Resistor vs. ???. It's written: one or other. I put the
>330K in there.

Yes, I need to update my document. Use solid line link and resistor space
marked 330k OR use dotted link and put 330k in the "empty" resistor.

>The 220N Caps under the Tubes are Ceramic as i had no others.
>If this matters i can change them later

Yes. Use better caps here. They are in the audio path.

Make sure you have the tube wires right - they can be confusing.

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:

Is there any disadvantage in using a TL072BCP instead of a TL072ACP??
(The BCP version costs about a nickel more, but has half the voltage
offset.)

Does anyone know a good source for nylon PCB mounting hardware?? I'm
looking for 4-40 hex threaded standoffs and nylon screws to use with
them. I'm thinking that 3/8" standoffs with 1/4" screws will work,
unless someone thinks another size would be better. I can't seem to
find a vendor that sells them at a reasonable quantity and price.

Does anyone know of a source for polystyrene caps??

Thanks :)

>Is there any disadvantage in using a TL072BCP instead of a TL072ACP??
>(The BCP version costs about a nickel more, but has half the voltage
>offset.)

Disadvantage? no. A lower offset is a good thing.

Ken

_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Is there any disadvantage in using a TL072BCP instead of a TL072ACP??
(The BCP version costs about a nickel more, but has half the voltage
offset.)

Does anyone know a good source for nylon PCB mounting hardware?? I'm
looking for 4-40 hex threaded standoffs and nylon screws to use with
them. I'm thinking that 3/8" standoffs with 1/4" screws will work,
unless someone thinks another size would be better. I can't seem to
find a vendor that sells them at a reasonable quantity and price.

Does anyone know of a source for polystyrene caps??

Thanks :)

Howdy,

Try Fastenal or nylon fasteners, etc.
Rig

At 12:11 PM 5/14/2007, Mark wrote:

>Does anyone know of a source for polystyrene caps??
>
>Thanks :)

http://www.surplussales.com/Capacitors/Poly-Unelco.html
--
john


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No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.7.1/805 - Release Date: 5/15/2007 10:47 AM

Sorry for the double posting. Apparently, yahoogroups temporarily
stopped sending me email.

I know that less voltage offset is a good thing. I was wondering if
that increase in performance was at the expense of other
specifications. In retrospect, it was probably a stupid question.

Mouser has both the polystyrene caps and the nylon hardware (although
the brand seems to be Eagle not Keystone). Digikey sells the nuts
and screws in quantities of 100, which is way more than I need. I
had been avoiding Mouser because their site doesn't work well with
Firefox on OS X. However, it seems to work well with Safari.
Overall, Mouser seems to have lower prices on hardware -- jacks,
switches, etc. -- than Digikey.

While I'm typing, does anyone know a vendor that sells 4-conductor
18AWG cable by the foot??

Thanks to everyone who responded.

>
>I know that less voltage offset is a good thing. I was wondering if
>that increase in performance was at the expense of other
>specifications.

Yes, the specification it was at the expense of is PRICE :)

_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Howdy,

Have you tried Jameco?
Rig

--- In cgs_synth@yahoogroups.com, Mark <yahoogroups@...> wrote:
>
>
> Sorry for the double posting. Apparently, yahoogroups temporarily
> stopped sending me email.
>
> I know that less voltage offset is a good thing. I was wondering if
> that increase in performance was at the expense of other
> specifications. In retrospect, it was probably a stupid question.
>
> Mouser has both the polystyrene caps and the nylon hardware
(although
> the brand seems to be Eagle not Keystone). Digikey sells the nuts
> and screws in quantities of 100, which is way more than I need. I
> had been avoiding Mouser because their site doesn't work well with
> Firefox on OS X. However, it seems to work well with Safari.
> Overall, Mouser seems to have lower prices on hardware -- jacks,
> switches, etc. -- than Digikey.
>
> While I'm typing, does anyone know a vendor that sells 4-conductor
> 18AWG cable by the foot??
>
> Thanks to everyone who responded.
>

At 11:36 AM 5/16/2007, Mark wrote:

>Overall, Mouser seems to have lower prices on hardware -- jacks,
>switches, etc. -- than Digikey.

Agreed.

>While I'm typing, does anyone know a vendor that sells 4-conductor
>18AWG cable by the foot??

I didn't notice this question until Rig answered it. You can get
cable (and connectors and so on) from the nice guys at Redco:
http://www.redco.com/
--
john


--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.7.3/809 - Release Date: 5/17/2007 5:18 PM

On 5/18/07, John Mahoney put forth:

>At 11:36 AM 5/16/2007, Mark wrote:
>
> >Overall, Mouser seems to have lower prices on hardware -- jacks,
> >switches, etc. -- than Digikey.
>
>Agreed.

Yes, and now that I'm using Safari with their site, I've found that
Mouser is easier on my mouse. Unlike Digikey, you can just click on
part numbers in the pdf catalog without having to cut and paste.
Although there are parts that Digikey sells that Mouser doesn't, and
vice-versa.

Anyway, I just ordered a bunch of hook-up wire from Jameco. I bought
two rolls of 24 AWG twisted pair, and a few rolls of 22 AWG single
conductor. In retrospect, I probably should have ordered 24 AWG
single conductor as well, so that it would be easier to mix and match,
especially considering I still have a couple of colors of 24 AWG hook-up
wire left. Also, I would have saved a few dollars going with all
24 AWG. That was my mistake.

> >While I'm typing, does anyone know a vendor that sells 4-conductor
> >18AWG cable by the foot??
>
>I didn't notice this question until Rig answered it.

It seems yahoogroups has been a bit screwy lately.

>You can get cable (and connectors and so on) from the nice guys at Redco:
>http://www.redco.com/

While Redco is a good source for data and audio cables, they are not
a good source for industrial control and multi-conductor power cables
without especially protective jackets -- what many people call tray
cable.

Numerous vendors sell 4/18 cable but it's either very expensive
(Digikey sells 100 ft rolls for $442) or comes in 1000 ft rolls
(around $250 from other vendors). I did find an agricultural supply
house selling 250 feet of 4-conductor 18 AWG stranded for $70, but
decided not to buy it. Instead, I bought 3 100 ft. rolls of 18 AWG
stranded from All Electronics for $10 each. I figured if building my
own power cables with cable ties is good enough for Synthesis
Technology, then it's good enough for me.


What's tray cable?? Why it's the cable that goes into a cable tray.
You can learn all about cable trays at the Cable Tray Institute
http://www.cabletrays.com/ :)