[time-nuts] TAPR TICC boxed
timeok at timeok.it
Fri Mar 31 02:04:36 EDT 2017
As protection circuit I have used a 51ohm from the front panel input to the TICC input than two diodes one from TICC input to gnd , other from TICC input to +5V. A swichable 51ohm from front panel input to gnd allow to have 1M or 50 ohm as input impedance.
The front panel leds are drived from 2N3904 transistors connected to:
A14 for the channel A
A15 for the channel B
PPS for reference 10MHZ (close to the pic divider)
PW1 for the TX data (a 2N3906 instead 04 is used as not inverting function)
Da "time-nuts" time-nuts-bounces at febo.com
A "time-nuts at febo.com" time-nuts at febo.com
Data Thu, 30 Mar 2017 20:15:09 +0000
Oggetto [time-nuts] TAPR TICC boxed
What did you do for input protection?
I want to build an input system for the TICC that incorporates some input protection, switchable terminator, possibly settable threshold and edge selects, and a switchable PICDIV divider like the TADD-2 Mini. That would allow inputs of <1 .. 100 (or maybe up to 1000) PPS and 1/5/10/15 MHz inputs.
The main problem I'm having is coming up with an input squarer circuit that is simple and cheap but can handle basically DC-15 MHz. Anybody got any ideas?
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the time-nuts