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Three Timer
Circuits - Kits
A series of 3 kits each with a unique
approach to timing a relay. 1st. uses a 555 as a stable oscilator &
14 stage ripple counter & a Pot to set osc. frequency. Select
outputs of 8,16,32,64,128, 256,512,1024, 4096, or 8192 counts. When
count is reached SPDT relay is energized. Contacts remain closed until
power is removed. 2nd. kit uses 555 as a monostable timer & pot to
set time. Header socket allows you to change the timing cap. Relay is
energized as soon as "Start" switch is pressed & remain
closed until time-out or "Reset" is pressed. 3rd. kit is a
timer based on R/C discharge to control a relay. Pot & Cap set the
time. Relay is energized when "Start" switch is pressed
&remain closed until time-out. LED shows relay status.Relaycontacts
rated 12V 10A. Kits are 12VDC powered. (more
info on how relays work)
See
CK1605.pdf for complete
details, including schematic and theory of operation. Requires
Adobe Acrobat Reader available at
www.adobe.com
for FREE!
Circuit A is available individually as
CK1611.
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