Re: coutdown 555 timer values?

On 21 Jul 2005 09:49:20 -0700, "Tristar500"
<robot@xxxxxxxxxxxxxxxxxxxxxx> wrote:

>I'm needing to put together a series of timers. Plan is to have6 timers
>all triggered at the same time. The first should time out and complete
>a circuit at 30 seconds, the second at 60 seconds, 60, 120, 150, 180
>
>Can anybody give me a basic circuit and values of the required
>resisters/capacitors here?

---
View using a non-proportional font like Courier.

+V>----+-----------+-----+----------+-------+
| | | | |
| | [RT1] +----+----+ |
[10K] [10K] | | Vcc _| |
| | +-----|TH R|--+
____ | | | |_ | |
TRIG>--+--[0.1µF]--+-+---|----O|T | |
| | |_ OUT|--|----->OUT1
| +----O|D GND | |
| | +----+----+ |
| [CT1] | |
| | | |
GND>--------------+--|---+----------+ |
| | |
| | |
| | |
| | +----------+-------+
| | | | |
| | [RT2] +----+----+ |
| | | | Vcc _| |
| | +-----|TH R|--+
| | | |_ | |
| +---|----O|T | |
| | | |_ OUT|--|----->OUT2
| | +----O|D GND | |
| | | +----+----+ |
| | [CT2] | |
| | | | |
+--|---+----------+ |
| | |
| | |
| | +----------+-------+
| | | | |
| | [RT3] +----+----+ |
| | | | Vcc _| |
| | +-----|TH R|--+
| | | |_ | |
| +---|----O|T | |
| | | |_ OUT|--|----->OUT3
| | +----O|D GND | |
| | | +----+----+ |
| | [CT3] | |
| | | | |
+--|---+----------+ |
| | |
| | |
| | +----------+-------+
| | | | |
| | [RT4] +----+----+ |
| | | | Vcc _| |
| | +-----|TH R|--+
| | | |_ | |
| +---|----O|T | |
| | | |_ OUT|--|----->OUT4
| | +----O|D GND | |
| | | +----+----+ |
| | [CT4] | |
| | | | |
+--|---+----------+ |
| | |
| | |
| | +----------+-------+
| | | | |
| | [RT5] +----+----+ |
| | | | Vcc _| |
| | +-----|TH R|--+
| | | |_ | |
| +---|----O|T | |
| | | |_ OUT|--|----->OUT5
| | +----O|D GND | |
| | | +----+----+ |
| | [CT5] | |
| | | | |
+--|---+----------+ |
| | |
| | |
| | +----------+-------+
| | | | |
| | [RT6] +----+----+ |
| | | | Vcc _| |
| | +-----|TH R|--+
| | | |_ |
| +---|----O|T |
| | |_ OUT|-------->OUT6
| +----O|D GND |
| | +----+----+
| [CT6] |
| | |
+------+----------+



Tout = 1.1 Rt Ct


--
John Fields
Professional Circuit Designer
.

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