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G0FTD > DESIGN 23.03.06 17:18l 33 Lines 1081 Bytes #999 (0) @ EU
BID : 644186G0FTD
Read: GUEST OE7FMI
Subj: Re: Logic gate IC question
Path: DB0FHN<DB0MRW<DK0WUE<7M3TJZ<ON0AR<GB7ESX<GB7NNA
Sent: 060323/1356z 02260@GB7NNA.#31.GBR.EU $:644186G0FTD [Witham, Esx]NNA V3.1
PROPOSED LOW BATTERY ALARM (NOT TESTED)
If anyone is interested in the thread about low voltage alarms then
here is my proposed circuit that makes do with a 555 IC in the absence
of a dedicated comparitor IC being available.
CAR BATT
+ ----------------------------
| | | (8)
| | ------
| \ | |
| / on v | |
| \<-----6 |
| / | |
| \ | |
| | | |
| | |NE555 3-----------X
\ | | |
/ off v| | |
\<------------2 |
/ | | | TO BUZZER OR LED
| | | |
| | ------
| | | (1)
- --------------------------------------X
CAR BATT
Set the off v resitor to control what voltage will make the output to XX
go high, and the on v resistor just needs to be set at the voltage
above the off to ensure that XX is low.
- Andy -
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