PS3100 Resonator PCBs

krisp14u · Joined: Nov 11, 2006 Posts: 206 Location: uk

Hi all got some worse/best price case scenarios for VTL5C3/2 in Europe

if the uk taxman dose his worst and if you give him the opportunity he will

the best will be 1.50 GBP / 2.25 EUR

the worst will be 2.00 GBP / 3 EUR

there will be postage on top of this at cost using the British postal service

a minimum order of 3 x VTL5C3/2

payment by paypal only unless its in GBP

i will give it a week to take orders by PM and then that will be it

i'm getting 40 for my self as a life time buy ( should last 6 months )

fonik

okay, we now have more than 40 pre-orders/reservations.

i will accept more pre-orders/reservations until
WEDNESAY 21 FEB 07, 12:00 UTC

then the PCBs will be manufactured. from then on further reservations are possible but when the PCBs eventually arrive they will be sold to all who made pre-orders before deadline 21feb07/1200UTC.
remaining PCBs will be sold to the later pre-orders according to list.
(as clear as mud)

so if you want one, hop on the bus!

ickystay · Joined: Nov 15, 2006 Posts: 143 Location: Oregon

Great price! I'll take 2 boards, please!

kryptic · Joined: Feb 16, 2007 Posts: 40 Location: somewhere

Hi. You can put me down for 2, please.

kk74 · Joined: Feb 15, 2007 Posts: 1 Location: Sweden

Put me down for two boards, please.

bubblechamber · Posted: Sat Feb 17, 2007 11:01 pm Post subject:

I have a few VTL5C1s around, will those work ok in this design?

goodrevdoc · Posted: Sat Feb 17, 2007 11:54 pm Post subject:

The /2 in the name means that the LDR side has 3 pins, so no, probably not.
-justin

andrewF · Posted: Sun Feb 18, 2007 2:41 am Post subject:

You can use them but will need 6 rather than 3 and it will require some 3D design work. I will be using 6 Macron Opto-controlled resistors which have just 2 pins, ie - a single resistor inside. They must be wired so the LEDs are in series. I will need 6 too!
You can always roll your own too - a couple of optoresistors, 1 LED and a lot of black electrical tape.

jksuperstar · Posted: Sun Feb 18, 2007 10:16 am Post subject:

Nothing big, but I don't know how much of a perfectionist you are.

The Silk Screen for T3 is labeled "freq2" on the board, I think it should be freq3? Like I said, I don't care (it will all be invisible behind the rack face), but thought you should know!

fonik · Posted: Sun Feb 18, 2007 10:24 am Post subject:

Scott Stites · Posted: Sun Feb 18, 2007 11:41 am Post subject:

Any optocoupler will work with adjusted values - lower the capacitance slightly and perhaps decrease the current limiting resistors a small tad (not too much, you don't want to pull too much current through the LEDs). There might be some variation in sweep response, but probably nothing to worry about. Response from fast control transients will certainly be different from type to type. Slower LDRs will obviously slew the response more so than faster LDRs. All will apply their particular response curve to any CV.

Another method to adapting different value LDRs is adjusting the resistance you place in parallel with them. The parallel resistance determines the max low value resistance (low frequency response) and also serves to slightly increase the high frequency response.

Fonik, I have a pretty good idea you're not getting anywhere near 5 ohms resistance. Portions of the Vactec datasheets mystify me a tad, and that's one of the things that always leaves me scratching my head. The five ohms resistance rating is at max allowable current and after 24 hours of dark time. Funny thing about LDRs is the light memory. After being dark a good long while, they will go to a much lower resistance when light is first applied, but quickly develop a memory, meaning later they won't go quite that low in resistance with the same amount of light applied. I don't think that entirely explains why such a low reading is spec'ed (dunno why entirely, unless it's because of my LED popping chickenhood). In my experience, I've never gotten near that reading with any VTL5C3. I don't make it a practice to push that much current through the LED, and haven't pushed it that far (except very briefly, by accident, I've far exceeded it. But the millisecond or so before the LED expired didn't give quite enough time to make any measurements Very Happy

). Still, I've come close, and they don't seem to approach anything near 5 ohms.

Be that as it may, if you have the opportunity to measure the resistance of the LDRs out of circuit, you'll probably be surprised at how many ohms your minimimum resistance actually is. You'll probably be surprised even by the in-circuit measurement.

This also will explain why operation at 12V vs 15V will vary - frequency response is directly attributable to how much current you pull through the LEDs. The more current, the lower the resistance, the higher the frequency response will be. 12V will supply less current than 15V, so, at 12V, the high end won't go quite as high without adjusting the current limiting resistor value or the cap value. Best way to determine these things would be on a breadboard. Well, at least for me. Smile

Cheers,
Scott

fonik · Posted: Sun Feb 18, 2007 1:04 pm Post subject:

bubblechamber · Posted: Sun Feb 18, 2007 2:47 pm Post subject:

thanks for all the input...looks like i'll be ordering some VTL5C3/2s.

fonik · Posted: Sun Feb 18, 2007 4:01 pm Post subject:

sascha neudeck · Joined: Feb 19, 2007 Posts: 10 Location: vienna

Put me down for one board, please.

cheers
sascha

Fernando · Posted: Mon Feb 19, 2007 1:19 pm Post subject:

I luckily found this thread on-time!

I sign for TWO PCBs, please Fonik

Thanks a million for the effort!

Fernando

PS Not shure if I can see it clearly: can the board be held by the pots? (= are the pots on the edge of the board?)

fonik · Posted: Mon Feb 19, 2007 2:12 pm Post subject:

no, the PCB is not gonna be held by the pots. i see no sense in doing this since you don't know what format people use.
me, if i etch PCBs for myself design them to be held by the (cliff) jack sockets mounted on 20mm grid Shocked

bugbrand · Posted: Mon Feb 19, 2007 4:53 pm Post subject:

Hiya (I been umm-ahh...)

Two for me please!

And, Paul Krisp4u -- I'd take at least 12 vacts out of your order, maybe more...

synthmonger · Posted: Mon Feb 19, 2007 6:34 pm Post subject:

Put me down for two. Or one if someone else wants one (I don't wanna be greedy Wink

).

Fernando · Posted: Tue Feb 20, 2007 4:26 am Post subject:

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Fernando · Posted: Tue Feb 20, 2007 5:44 am Post subject:

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

CJ Miller · Joined: Jan 07, 2007 Posts: 368 Location: 127.0.0.1

What a great coincidence, I just decided last weekend to make a few PS3100 resonators! Now there's these gorgeous PCBs!

If I may, I am definately down for three of these. Thank you so much for doing this project.
CJ

fonik · Posted: Wed Feb 21, 2007 5:04 am Post subject:

okay, that's it! as said before i close the list of advance-orders now. nevertheless i'm still taking requests and will start a waiting-list.

everybody who made an advance order got a PM already.
i will take no money as long as i have not got the PCBs and populated and tested at least one board. so don't hurry.

the production and delivery of the PCBs will take at least two weeks.