That simulates your short reset signal.the source you are using in the lower right hand corner with the label reset
What is its amplitude?
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That simulates your short reset signal.the source you are using in the lower right hand corner with the label reset
Why do you think that would occur?if the temporary shorting of the timing cap results in relay drop-out
the signal is a 60kHz, 100mVp-p signal. However, it gets converted to a 0.6V (typ.) when freq. is within band.That simulates your short reset signal.
What is its amplitude?
I think what alec_t was referring to was the issue I told him about me using an OpAmp as a buffer since the output of the timer goes to the SSR but the SSR was loading down the timer and I was having an impedance mismatch. block diagram of the circuit is shown belowWhy do you think that would occur?
The 555 output will stay high until the capacitor voltage charges to the THRES level, which the Reset signal will delay by discharging the cap to 0V.
It shouldn't. I noticed a glitch when simulating, but it may have been an artifact (or me mis-reading something ).Why do you think that would occur?
That is new information to me.the signal is a 60kHz, 100mVp-p signal. However, it gets converted to a 0.6V (typ.) when freq. is within band.
The schematic you provided me with works!! I am able to reset the time on the timer while keeping the timer on!That simulates your short reset signal.
What is its amplitude?
So I found a test point on the device that does output 5 volts when the signal is detected. Hence the success in the circuit. The only issue I am facing now is the one mentioned above.That is new information to me.
Then you would need to amplifier and rectify the signal to give the 5V pulse signal required for the reset.
An op amp could readily perform that task.
What is the output impedance of the 60kHz source?
What is the duration of the signal?
Don't understand that.the timing capacitor discharges very slowly instead of immediately discharging to zero
The DISC is directly connected to the capacitor. Diagram shows how I have connected the circuit. It does seem rather odd to me too that it won't discharge immediately. When I look at the voltage across the capacitor with a multimeter I can see its a rather slow discharge not immediately to zero; whereas, when the transistor momentarily shorts the timing cap, the cap immediately discharges to zero.Don't understand that.
The DIS pin should immediately discharge the capacitor to ground when the pulse naturally ends.
Do you have the DIS pin connected directly to the capacitor?
It would seem you don't.
What turns the timer power off?
Agreed. Discharge of a 100uF timing cap wouldn't normally kill the 555 discharge transistor.a faulty 555.
could you explain what you mean by this?maybe a small series R would add some prudent margin to the application.
So I figured one thing out regarding this problem however I am not sure if adding a small resistor in series with the timing cap is the solution or not.If the DISC connection doesn't discharge the cap at the end of the pulse then you may have a faulty 555.
Has the DISC pin every been accidentally connected directly to the V+ (5V) voltage?
How are the 9V and the 5V connected to the 555?when I integrate the timer with the rest of the circuit, the device turns on with a +9V then the timer gets its power from a test point on the device which is a +5V and then the timer's output connects to a Solid State relay, that is when the timing cap does not discharge instantaneously. I