Will this circuit work? - Page 2 - Electronic Circuits Projects Diagrams Free

Roff · 7th August 2008, 02:10 AM

Quote:

Originally Posted by on1aag

I've got an excuse, it's 3 a.m.

on1aag.

No it ain't! It's 7PM!

b_reagle · 7th August 2008, 02:12 AM

Thank you very much!!! I knew something was just not right. Thanks again..

b_reagle · 7th August 2008, 02:16 AM

Is this right then??

b_reagle · 7th August 2008, 02:20 AM

Isn't the base current 4.9mA in the unnumbered Q's?

Roff · 7th August 2008, 02:30 AM

I would change R5 to 100 ohms.
If you don't need the extra gate, either connect the inputs to GND, or put it in parallel with the "output" gate to speed up MOSFET switching.
How much current does your relay require?

EDIT: I just saw your last post. R1 and R2 should be around 10k. If you don't get solid "0" levels at B and C, change R3 and R4 to 10k, and R1 and R2 to 100k.

b_reagle · 7th August 2008, 02:34 AM

I'm not sure. I am not very good at finding such things. mr62-5fsry

Roff · 7th August 2008, 02:36 AM

Quote:

Originally Posted by b_reagle

I'm not sure. I am not very good at finding such things. mr62-5fsry

I can't find a datasheet. Who made it?

b_reagle · 7th August 2008, 02:41 AM

it says:

rspo5h2co5s1
mr62-5fsry
nec japan
.6A 110 vdc
1A 125vac
b5321
It is orange
I know it it a 5 vdc DPDT relay.
No meter this week for me either. $$
I got them in Vocational School 12yrs ago.

b_reagle · 7th August 2008, 02:59 AM

Thanks for the help, both of you. Is time (10pm) for bed. The quest will continue tomorrow. Thanks again..

b_reagle · 7th August 2008, 04:52 PM

Hello again,
I am having a problem with the circuit you posted Roff.
in your circuit X = AB + |AC =1
shouldn't X = A|B = |AC = 1
like this:
I am not sure but something is still fishy about the circuit..
Thanks for the help.

b_reagle · 7th August 2008, 05:03 PM

Found some stuff on relay. http://www.rjcomponents.com/stock/It...?id=1922001112
This doesn't have to be the relay. I just have a few laying around from school. I just want a low power low voltage(2vdc-6vdc) relay. I am not sure if this is the best way to switch the polarity on the motor. It is the way I came up with for a project. Seems to work fine. I don't see too many people use it though. Mostly h-bridge's.

Roff · 7th August 2008, 05:29 PM

Quote:

Originally Posted by b_reagle

Hello again,
I am having a problem with the circuit you posted Roff.
in your circuit X = AB + |AC =1
shouldn't X = A|B = |AC = 1
like this:
I am not sure but something is still fishy about the circuit..
Thanks for the help.

I don't know. You changed the polarity of the B phototransistor from noninverting to inverting after I posted my schematic. Your new schematic should work, if you want to keep the new orientation of the B phototransistor.

b_reagle · 7th August 2008, 05:35 PM

If I switch B then I won't have to invert it right?

Roff · 7th August 2008, 07:05 PM

Quote:

Originally Posted by b_reagle

If I switch B then I won't have to invert it right?

Yes. Also, as I said before:

Quote:

R1 and R2 should be around 10k. If you don't get solid "0" levels at B and C, change R3 and R4 to 10k, and R1 and R2 to 100k.

b_reagle · 7th August 2008, 07:19 PM

So this would be the best way? With 3vdc - 6vdc? And thanks again for your time.

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7th August 2008, 02:12 AM	(permalink)
b_reagle	Thank you very much!!! I knew something was just not right. Thanks again..

7th August 2008, 02:20 AM	(permalink)
b_reagle	Isn't the base current 4.9mA in the unnumbered Q's?

7th August 2008, 02:30 AM	(permalink)
Roff	I would change R5 to 100 ohms. If you don't need the extra gate, either connect the inputs to GND, or put it in parallel with the "output" gate to speed up MOSFET switching. How much current does your relay require? EDIT: I just saw your last post. R1 and R2 should be around 10k. If you don't get solid "0" levels at B and C, change R3 and R4 to 10k, and R1 and R2 to 100k. __________________ Ron (aka Rube) Last edited by Roff; 7th August 2008 at 02:34 AM.

7th August 2008, 02:34 AM	(permalink)
b_reagle	I'm not sure. I am not very good at finding such things. mr62-5fsry

7th August 2008, 02:41 AM	(permalink)
b_reagle	it says: rspo5h2co5s1 mr62-5fsry nec japan .6A 110 vdc 1A 125vac b5321 It is orange I know it it a 5 vdc DPDT relay. No meter this week for me either. $$ I got them in Vocational School 12yrs ago.

7th August 2008, 02:59 AM	(permalink)
b_reagle	Thanks for the help, both of you. Is time (10pm) for bed. The quest will continue tomorrow. Thanks again..

7th August 2008, 05:03 PM	(permalink)
b_reagle	Found some stuff on relay. http://www.rjcomponents.com/stock/It...?id=1922001112 This doesn't have to be the relay. I just have a few laying around from school. I just want a low power low voltage(2vdc-6vdc) relay. I am not sure if this is the best way to switch the polarity on the motor. It is the way I came up with for a project. Seems to work fine. I don't see too many people use it though. Mostly h-bridge's.

7th August 2008, 05:35 PM	(permalink)
b_reagle	If I switch B then I won't have to invert it right?