Electronic Circuits and Projects Forum

hi every body.
I'm working around a circuit , but now I have a problem.
In my circuit outlet there are below constants:

5VDC ,5mA

I can't use these parameters foy any purpose becouse they are too low.
I need a DC/DC convertor and current buffer to drive 24VDC & 250mA relay.

I have 24 VDC in another positon and can use it.

pls suggest an IC or circuit.

thanks.

what about 24VDC @100mA?

?????You need 24V at 100mA and you don't have any power?????
A DC/DC converter will not fix this problem.

Originally Posted by jorjo

what about 24VDC @100mA?

Change the 12V in the circuit to 24VDC.

As mentioned above, you need a 24VDC supply, which you said you already have in your first post.

I have 24 VDC from another position in circuit.so I can have enough power .
Isn't it?

also unlimited current.

Please post a schematic.

You don't need to limit the current, the relay will only draw as much power as it needs.

If your power supply is only rated to supply 100mA and the relay requires 250mA, then you're out of luck. You either need to get a power supply which can provide 250mA or get a relay which uses less power.

I draw your recommended circuit in proteus.

but it didn't work properly.
where is output?
answer: collector, I think.

when input is hi or low collector didn't change,becouse you used inductor in collector.