root@brain.UUCP (Chuck Shotton) (02/14/90)
Has anyone actually constructed a "sound input device" as described in the SID documentation yet? I'd be interested in the following: 1) any problems encountered with the schematic or construction 2) any software gotchas 3) a source for the ceramic resonator listed in the parts list. I can't find this thing anywhere. The factory, muRata Erie, won't sell direct, and all of their distributors have minimum orders of $200. Thanks, Chuck Shotton cshotton@girch1.hsch.utexas.edu ...!buster!brain!root
arvidson@euclid.MATH.ColoState.Edu (John Arvidson) (02/20/90)
> Has anyone actually constructed a "sound input device" as described in the > SID documentation yet? I'd be interested in the following: > 1) any problems encountered with the schematic or construction > 2) any software gotchas > 3) a source for the ceramic resonator listed in the parts list. I can't find > this thing anywhere. The factory, muRata Erie, won't sell direct, and all > of their distributors have minimum orders of $200. I ran into the same problem... I can't find a source for the ceramic resonator and also the quad op amp. I'd be interested in sources or substitutes if anyone knows of them. John Arvidson arvidson@euclid.math.colostate.edu
cc4b+@andrew.cmu.edu (Christopher Brian Cox) (02/21/90)
>I can't find a source for the ceramic resonator and also the quad op amp
The Quad Op Amp is available from Jamco Electronics
Part # TL064CN
Cost $1.49 each (Spring 1990 catalog)
I'm still trying to find a resonator or an alternative.
CHrisksmith@andrew.ATL.GE.COM (Karl Smith) (02/22/90)
In article <MZsWyjG00Ui04Kw3F7@andrew.cmu.edu> cc4b+@andrew.cmu.edu (Christopher Brian Cox) writes: > >>I can't find a source for the ceramic resonator and also the quad op amp > >The Quad Op Amp is available from Jamco Electronics >Part # TL064CN >Cost $1.49 each (Spring 1990 catalog) > >I'm still trying to find a resonator or an alternative. >CHris I sent mail to one of the authors on GEnie, and received the following reply. I've been short on free time recently, and haven't tried it yet. --- Item 6229855 90/02/01 19:53 From: D.FLECK David C. Fleck To: K.SMITH9 Karl J. Smith Sub: SID parts Karl, Best answer I can give you now is the following: Replace the resonator with a crystal from JAN Crystals (813) 936-2397 1.5578 Mhz, HC33U case, parallel resonant, 20 pF load cap., .005% approx. $10 and 2-3 weeks lead time. this will also require circuit changes as follows: remove R2 1K resistor and replace with a short. Change C2&C3 from 100pF to 33pF (DigiKey PN P4018). You might try using left over 22pF's first. I have the parts on order to double check the circuit but have not yet. Sorry for the inconvenience and additional cost. JAN was the fastest source with a reasonable time that I could find. They specialize in small quantities. Regards, Dave
rrw@naucse.UUCP (Robert Wier) (02/22/90)
"Ceramic Resonator"? Took me awhile to figure out that you
guys were talking about a CRYSTAL.
Anyway, you might try either
JAN crystals
800-JAN-XTAL
or
International Crystal Manf Co.
405-236-3741
Or better yet, someone redesign it to use one of the standard
tv color burst crystals available from Radio Shack (easy for me
to say... :-) ....
I'd be very interested in a PC board if one turns up and someone
would post the source...
---------------------------------------------------------------------
- Bob Wier Northern Arizona University
summer:Ouray, Colorado winter:Flagstaff, Arizona
USENET: ...arizona!naucse!rrw | BITNET: WIER@NAUVAX | WB5KXHjdu@cbnewsd.ATT.COM (john.d.unruh) (02/23/90)
In article <4790@ccncsu.ColoState.EDU> arvidson@euclid.MATH.ColoState.Edu.UUCP (John Arvidson) writes: > >I ran into the same problem... I can't find a source for the ceramic resonator >and also the quad op amp. I'd be interested in sources or substitutes if >anyone knows of them. > >John Arvidson I have looked at the schematics. From what I saw, I think that the ceramic resonator is just being used as the frequency determining component for the oscillator portion of the circuit. I don't know of any reason that this part has to be used rather than a crystal cut for the proper frequency. After all, what that part of the circuit is doing is developing a square wave to clock the next device (don't have schematics handy and don't remember what it is). This is frequently done using some inverters and a crystal. I expect that some circuit modifications other than just putting in a crystal at the proper frequency might be necessary to make it work properly. John Unruh
al@io.cs.pittsburgh.edu (Alan Martello) (02/27/90)
Well, my solution which I am attempting (my order is in the mail) is to
use e 3.000 MHz Ceramic Resonator from Digi-Key and just divide it by 2.
Yes, I know that will NOT give me 1.558 Mhz but 1.5 Mhz but heck, for
$1 for the resonator plus .39 for the flip flop, it is worth a try.
From my superficial reading of the hardware description, it sounded
like the mac was being externally clocked by my chosen frequency,
so it (hopefully) won't matter if I'm ~3% low.
Flames to /dev/null, but constructive criticism/feedback to comp.sys.mac.hardware
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Alan R. Martello Electrical Engineering Dept.
al@ee.pitt.edu University of Pittsburgh
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