Hey guys, I'm new to electronics so go easy please!
The project, is to control solenoids from a PC, the PC part I've done using PIC's to fire ouputs to a ULN2803 darlington driver. I've tried using just the ULN2803 but it burn't out as the solenoid drew to much current.
I've created a diagram of what I think the circuit should work like and would like everyone's opinion whether changes need to be made. However after destroying quite a bit of kit with shards of plastic flying about I'd rather have a second opinion.
The ULN2803 should drive the TIP3055 transistor which uses the secondary 16vdc higher power output supply to drive the solenoid. This also has a 2200uf capacitor to help give a surge to the solenoid.
Hopefully this will fire 8 solenoids so will mimic the same circuit for all 8 each having it's own transistor.
It has to use a separate PSU.
I do not want to use relays unless absolutely necessary as I've seen this done without also the cost of using high output relays.
These solenoids usually need a capacitor discharge unit (CDU), http://www.brian-lambert.co.uk/CDU.gif the original page of this image is http://www.brian-lambert.co.uk/Electrical-2.htm there is a lot of info on this page most not relevant your best off using the gif link.
The datasheet for the TIP3055 is http://www.rapidonline.com/netalogue/specs/81-0812.pdf
The datasheet for the ULN2803 is http://www.datasheetcatalog.org/datasheets/90/366828_DS.pdf
There is no datasheet for the solenoid, however this is what it is, http://www.gaugemaster.com/item_details.asp?code=PEPL-10
I hope that I've given all the info for you to help.
The project, is to control solenoids from a PC, the PC part I've done using PIC's to fire ouputs to a ULN2803 darlington driver. I've tried using just the ULN2803 but it burn't out as the solenoid drew to much current.
I've created a diagram of what I think the circuit should work like and would like everyone's opinion whether changes need to be made. However after destroying quite a bit of kit with shards of plastic flying about I'd rather have a second opinion.
The ULN2803 should drive the TIP3055 transistor which uses the secondary 16vdc higher power output supply to drive the solenoid. This also has a 2200uf capacitor to help give a surge to the solenoid.
Hopefully this will fire 8 solenoids so will mimic the same circuit for all 8 each having it's own transistor.
It has to use a separate PSU.
I do not want to use relays unless absolutely necessary as I've seen this done without also the cost of using high output relays.
These solenoids usually need a capacitor discharge unit (CDU), http://www.brian-lambert.co.uk/CDU.gif the original page of this image is http://www.brian-lambert.co.uk/Electrical-2.htm there is a lot of info on this page most not relevant your best off using the gif link.
The datasheet for the TIP3055 is http://www.rapidonline.com/netalogue/specs/81-0812.pdf
The datasheet for the ULN2803 is http://www.datasheetcatalog.org/datasheets/90/366828_DS.pdf
There is no datasheet for the solenoid, however this is what it is, http://www.gaugemaster.com/item_details.asp?code=PEPL-10
I hope that I've given all the info for you to help.
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