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STD Irrigation Step-Down

License: Public Domain

Mode: Editors' pick

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Update time: 2024-06-14 01:56:00
Creation time: 2024-05-12 05:07:34

Step down AC voltage from +27V to +24V.  Line smoother to prevent ringing with AC Pump Start Relay.


A common issue with irrigation pump start relays being located too close to the controller which introduces EMI noise during initial 60A in-rush current that causes relays to quickly latch and unlatch.  This should hopefully solve the issue by dropping the 27VAC+ source to 24VAC nominal with a voltage divider and smooth any AC line ringing with a heavy duty shunt resistor.

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ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier JLCPCB Part Class spiceSymbolName Contributor
1 WJ128V-5.0-2P P1,P2 CONN-TH_2P-P5.00_WJ128V-5.0-2P 2 WJ128V-5.0-2P KANGNEX(康奈克斯电气) LCSC C8269 Extended Part WJ128V-5.0-2P
2 10Ω R1 RES-TH_BD11.0-L49.5-P56.00-D1.0 1 CR-L15W10Ω 5% P CCO(千志电子) LCSC C216391 Extended Part CR-L15W10ΩJ LCSC
3 82Ω R2 RES-TH_BD8.0-L23.5-P27.50-D0.8 1 EWWR0006J82R0T9 RESI(开步睿思) LCSC C349004 Extended Part EWWR0006J82R0T9 LCSC


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