kls30@duts.ccc.amdahl.com (Kent L Shephard) (05/31/91)
I need some crystals or oscillators that have frequencies of: 5.6448 \ 11.2896 \These are in MHz and I need any one of the listed components. 22.5792 /The lower frequncies are preferred but I will take anything. 45.1584 / 6.144 \ 12.288 \The same applies here as stated above. 24.576 / 49.152 / I can use 1 from each group, lower frequency is preffered. I can use frequency dividers to get lower frequency if the high frequency is all that is available. I prefer oscillators but I can live with crystals. Does anyone know for sure a source for thses parts in very, very small quantities. I know where I can have them made but I don't have $100 to spend for just 2 crystals. BTW - I have checked just about everywhere in the Sunnyvale, Ca. area with very little luck. Reply via email, not everyone cares if I find crystals or not. -- /* -The opinions expressed are my own, not my employers. */ /* For I can only express my own opinions. */ /* */ /* Kent L. Shephard : email - kls30@DUTS.ccc.amdahl.com */
tomb@hplsla.HP.COM (Tom Bruhns) (06/01/91)
kls30@duts.ccc.amdahl.com (Kent L Shephard) writes: > I need some crystals or oscillators that have frequencies of: (frequencies omitted) > Does anyone know for sure a source for thses parts in very, very small > quantities. I know where I can have them made but I don't have $100 > to spend for just 2 crystals. > Reply via email, not everyone cares if I find crystals or not. This seems like almost an FAQ, so I'll post. Some crystal manufacturers have minimum orders far below $100. They make what you want, within some limits: they have a variety of case styles and tolerances and oven/non-oven options to choose from. You can within limits pick fundamental or overtone mode. You choose the load capacitance (or series resonance). Here are two to try: JAN Crystals, 2341 Crystal Drive, Ft. Myers, FL 33906 (800)237-3063. They accept VISA orders. .01% tolerance crystals in the range you mentioned are around $5 each, I believe. No minimum order that I'm aware of, but they might not like a $5 VISA order. International Crystal Manufacturing, 701 W. Sheridan (PO Box 26330) Oklahoma City, OK 73126. (800)426-9825. Prices slightly higher than JAN; don't know if they accept VISA orders over the phone. Jan is a bit slow (a couple weeks, typically). International used to be very fast, but I haven't ordered from them in years 'n years, and they don't advertise speed like they used to. Jan does have an express service, still much under $100! Custom crystals are cheap enough that unless you aren't picky about the frequency (or it's a really standard frequency like 3.579545MHz), you are better off ordering than asking.
tomb@hplsla.HP.COM (Tom Bruhns) (06/05/91)
kls30@duts.ccc.amdahl.com (Kent L Shephard) writes: > > I need some crystals or oscillators that have frequencies of: > > 5.6448 \ > 11.2896 \These are in MHz and I need any one of the listed components. > 22.5792 /The lower frequncies are preferred but I will take anything. > 45.1584 / > > 6.144 \ > 12.288 \The same applies here as stated above. > 24.576 / > 49.152 / Further to my earlier reply: DigiKey lists a 6.144 crystal for $1.37 or oscillator for $3.71. 11.0592 looks like as close as they list for the first group. Also I got one piece of email from a contributor I respect a lot saying he had had some trouble with JAN getting crystals right on frequency. If your tolerance requirement is .01% or looser, that shouldn't be a problem. He also said International has never had the same problem. JAN has done OK for me, at least with fundamental mode crystals (at least the first two freq's in each group).