Hi - first time poster here. I'm a 55 year old tinkerer....very minimal understanding of electronics, but can usually figure something out if I bang my head against it long enough.
Here is what I'm trying to solve: I've built a vacuum pump for vacuum bagging fiberglass/carbon/epoxy RC airplane wings. It is controlled by a n.o. vacuum switch operating a relay that turns the pump on if the vac. drops below the set pressure and off when that pressure is reached. The pump cycles on/off too frequently, tripping the over-temp. switch on the motor. I want to add a timer to delay the restarting of the motor for a minute or two every time it shuts off.
I've been poking around on this site and found this circuit in the "Worksheets" section. If I'm understanding things right, this may be a good starting point for what I'm trying to do? As configured it supposedly has a delay of ~4 seconds. And changing some resistor & capacitor values will produce a different delay? Maybe a variable resistor to make the delay adjustable?
Thanks for any guidance, corrections, or slaps upside the head you'd like to offer!
- Jim
Here is what I'm trying to solve: I've built a vacuum pump for vacuum bagging fiberglass/carbon/epoxy RC airplane wings. It is controlled by a n.o. vacuum switch operating a relay that turns the pump on if the vac. drops below the set pressure and off when that pressure is reached. The pump cycles on/off too frequently, tripping the over-temp. switch on the motor. I want to add a timer to delay the restarting of the motor for a minute or two every time it shuts off.
I've been poking around on this site and found this circuit in the "Worksheets" section. If I'm understanding things right, this may be a good starting point for what I'm trying to do? As configured it supposedly has a delay of ~4 seconds. And changing some resistor & capacitor values will produce a different delay? Maybe a variable resistor to make the delay adjustable?
Thanks for any guidance, corrections, or slaps upside the head you'd like to offer!
- Jim