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Since the solenoid was no longer activating, it seemed like a replacing it was in order. The replacement solenoid that I purchased was rated 24 VDC but didn't activate when connected. Perhaps the transistor Q1 does support the amount of current required by the new solenoid.
I opted to bypass the 555 timer circuitry by connecting pin 4 of the internal connector (under cap) to ground. The 555 timer is not required.
New Parts
| Part | Cost | Image |
|---|---|---|
| Baomain 1/4 Inch Brass Electric Solenoid Valve for Air Water Valve N/C (Normally Closed) DC 24V | $22.00 CAN |
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Generic Pneumatic Push in Quick Touch to Connect Fitting 1/4" OD Tube x 1/4" Male NPT 90 Deg Swivel Elbow Coupler. I would have bought straight ones but couldn't find them for a good price. | $13.00 CAN for 5 |
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