- Joined Feb 27, 2016
A beep signals the start of a red led for 1 min then another beep and red led stays on for another 7 sec then changes to green for 4 sec and back to red starts all over again.Had to go back to page 1 to remember what we were doing. Red LED is on except when green is on ???
Red LED is on when Q1 or Q2 are on, so we skip Q4 & just OR the outputs into 300 ohm, & red LED. I'll correct the last schematic. Sorry for my confusion.
Just finished this one but cant get red and green led to work so must have done something wrong!
All pins 4 are high but still no red or green led'sDo not be to hasty in breaking it down. What version do you have on breadboard- Range Timer C ?
Q1-2 were working before so check Q1-2-3, pins 4, are they high, if not check Q5 connections. Is R 17
connected? It should pull all pin 4s high if Q5 is off. A reversed or really leaky C8 , or missing R15 could hold pins 4 low.
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