Re: Potter's 5508w schematic -- New 3C

[ Show ]

Support VoyForums

[ Shrink ]

VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, [9], 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 14:34:19 01/25/02 Fri
Author: Potter
Subject: Re: Potter's 5508w schematic
In reply to: sphinx 's message, "Potter's 5508w schematic" on 05:09:24 01/25/02 Fri

The overlay is the original way I planned it but after checking voltages I reversed the output capacitor - this would vary according to the application and because the DC voltage difference is very small probably doesn't matter with a bridging resistor fitted. Use the overlay.
A crystal will work perfectly and it's more stable in terms of ageing and temperature related frequency drift.
NOTE: If you use an oscillator module, you'll need to provide a means of disconnecting it from the SX when programming in-circuit. The TTL outputs of the modules don't like the 12.5V programming voltage and self-destruct but crystals & resonators are not harmed by it.

Good luck

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

Re: Potter's 5508w schematic -- sphinx, 20:54:25 01/25/02 Fri
- Re: Potter's 5508w schematic -- Potter, 21:44:10 01/25/02 Fri
  - Re: Potter's 5508w schematic -- sphinx, 19:40:40 01/28/02 Mon
  - Re: Potter's 5508w schematic -- sphinx, 19:54:38 01/28/02 Mon
    - Re: Potter's 5508w schematic -- Potter, 14:44:06 01/29/02 Tue
      - Re: Potter's 5508w schematic -- sphinx, 04:10:50 01/31/02 Thu
        Re: Potter's 5508w schematic -- Potter, 05:48:19 01/31/02 Thu
        Re: Potter's 5508w schematic -- sphinx, 02:05:13 02/01/02 Fri
        Re: Potter's 5508w schematic -- Potter, 18:06:14 02/01/02 Fri
        Re: Potter's 5508w schematic -- sphinx, 20:09:27 02/05/02 Tue
        Re: Potter's 5508w schematic -- Potter, 07:25:26 02/07/02 Thu
        Chip preservation tip -- Potter, 08:15:43 02/07/02 Thu
- tocons 5507 schematics in Brasil -- cablefree, 13:10:44 02/23/02 Sat

[ Contact Forum Admin ]

Forum timezone: GMT-8
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums^(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.