Published:2009/7/21 22:14:00 Author:Jessie | From:SeekIC
Ultralong delay timer using two 8250 16-pin DIPs. The output is normally high when reset, and goes low upon application of a trigger input. It stays low for a duration of (100)2 or 10,000 cycles. Total timing cycle for the two 8250s can be programmed from TO = 1RC to TO = 9999RC in 10,000 discrete steps by selectively shorting any combination of pins 1 through 8 from both units to the output bus (courtesy Intersil, Inc.).
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Ultralong_delay_timer_using_two_8250_16_pin_DIPs.html
Print this Page | Comments | Reading(3)
Code: