How to implement a set of monostables in LTspice....

[Mike Deblis]

Title says it all, really... I want to have a couple of interconnected
monostables but am not at all sure how to do it... I may be missing
the obvious...

Any ideas gratefully received...

Thanks

Mike

 

[Helmut Sennewald]

"Mike Deblis" <mdeblis@hotmail.com> schrieb im Newsbeitrag
news:bc45f679.0311270433.4bac132@posting.google.com...

Title says it all, really... I want to have a couple of interconnected
monostables but am not at all sure how to do it... I may be missing
the obvious...

Any ideas gratefully received...

Hello Mike,
there are models for a 74HC(t)123 and TLC555 in the "Files" section of
the LTSPICE-Yahoo group. www.groups.yahoo.com/ltspice

The basic idea:
You could use a flipflop set by the edge of a trigger impuls.
After the FF is triggered, the OD switch is off and thus the
capacitor is charged via resistor R. Finally the FF will be
reset after the voltage of the capacitor has reached a certain
level, e.g. 2/3 of Vcc like in the lm555.
Some additional circuit is needed if you want features like
retrigger capabilty.

+
|
|R|
|
+-----------------------------------
Trig. v | |
-->|Flipflop|-+-|OD|--+-----|Schmitt-Inv.|--
| |C|
out |
---

OD = open drain buffer or mosfet
Schmitt-Inv. = Schmitt trigger inverter

Best Regards,
Helmut

 

[Mike Deblis]

"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message news:<bq60mi$ipv$04$1@news.t-online.com>...

Hello Mike,
there are models for a 74HC(t)123 and TLC555 in the "Files" section of
the LTSPICE-Yahoo group. www.groups.yahoo.com/ltspice

Thanks Helmut,

The Yahoo group is an excellent resource for LTspice users - loads of good stuff...

Mike