Franc Zabkar wrote:
On 27 Aug 2006 01:40:31 -0700, put finger to keyboard
and composed:
Hi all, I want to convert a mains type digital daily/weekly timer to
12v (nom.) operation.I know that the cct. inside (relay) etc operates
at 28v, and normally could float at mains potential in normal use, this
conversion is required for use in a boat so no mains likely to be
present! if i change the relay to a 12v one, with proper protection
(fusing etc) where abouts in the cct could I disconnect the "mains
dropper" part and connect the battery 12v?is there a site containing
ccts that use mains dropping cap/res type ccts...with thanks,
Can you see any zener diodes? My LCD, battery backed, digital timer
uses one for voltage reduction.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Sorry for the delay in replying...thank you for all your suggestions
the timer is an LCD type (with backup lithium cell) ,the reason I am
using this (on boat) is because of its programmability, i.e. multiple
switching many times daily/weekly....not so sure a "simple 12v off the
shelf timer would do this, possibly NASA produces this sort of thing
way out of budget!..because it is battery powered and has quite low
standby power requirements it would be suitable for an unattended boat
(on water!).I would use it to "transmit short range" FM signals (ie
battery volts ,bilge water level,intrusion,etc.)to a reciever in my
car!This may sound a bit "over the top" but cant see a reason why
not.....thinking about the idea of using an old prepay mobile phone as
a burglar/intrusion alarm simple solenoid to press call
button....hmmmm?...perhaps two calls in two minutes to signify bilge
water alarm,,,three calls to indicate ..well its unending!
I think I really should get stuck in to these PICS. . .these I assume
would control all this?
I will persevere with the digital timer effort,thank you all again for
your input,sorry to so longwinded!any comments appreciated....
PS I hope I put this reply in the right place?