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Old 01-29-2015, 10:44 PM
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John John is offline
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Let's say you have relays or solenoids that require 9VDC to activate. You can use a ULN2803A IC to drive them as shown in the attached diagram.

This would work equally well if the relays or solenoids require 5VDC or 12VDC. Just change the power supply in the diagram accordingly.

For more details on the ULN2803A, check out the TI product page:

http://www.ti.com/product/uln2803a

It's widely available, and costs less than $1 per IC.
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Last edited by John; 02-23-2015 at 09:42 AM. Reason: eliminating current claims to avoid confusion for now.
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Old 03-09-2015, 09:08 PM
bandenoire bandenoire is offline
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In this scenario, would you need to install any diodes into the circuit to account for the solenoids kick back of voltage?
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Old 03-10-2015, 06:44 PM
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Quote:
Originally Posted by bandenoire View Post
In this scenario, would you need to install any diodes into the circuit to account for the solenoids kick back of voltage?
Hi bandenoire, welcome to the forum.

The ULN2803A has built-in protection diodes for each of its outputs. So as long as the solenoid power supply is connected to the ULN2803A "COM" pin (pin #10), no additional diodes are required.
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Old 01-03-2016, 08:14 PM
bandenoire bandenoire is offline
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sorry to bring up an old thread but would this circuit work with an AC circuit - say 18VAC? thanks in advance
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