Subject:
|
Re: HB IR transmit circuitry problem
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Wed, 3 Sep 1997 02:09:33 GMT
|
Original-From:
|
Fred G. Martin <fredm@media.^nospam^mit.edu>
|
Viewed:
|
1245 times
|
| |
|
|
what value are you using for the R4 resistor? There was an incorrect
value in some of the Handy Board documentation and it might not be
fully expunged. Also, are you using a polypropylene capacitor for C6.
-Fred
--
This message was composed using Articulate Systems' PowerSecretary,
a Macintosh-based speech-to-text dictation system.
See http://www.artsys.com for more information.
In your message you said:
> I just finished building my Handy Board and I was testing the IR
> transmit circuitry. I found that the oscillator was actually
> oscillating @ 57kHz instead of 39-41kHz. That makes it useless for now!
> I made sure to get the exact capacitor and resistor values as specified.
>
> I'm wondering if the value of the resistor changed during soldering due
> to thermal shock or the cap is just of value, or would R7(10K) res
> affect it?
>
> By the way what's the purpose of that R7 anyways?
>
> Laz
>
|
|
Message is in Reply To:
 | | HB IR transmit circuitry problem
|
| I just finished building my Handy Board and I was testing the IR transmit circuitry. I found that the oscillator was actually oscillating @ 57kHz instead of 39-41kHz. That makes it useless for now! I made sure to get the exact capacitor and resistor (...) (27 years ago, 30-Aug-97, to lugnet.robotics.handyboard)
|
2 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
