• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

MAX232 Works only Once

Status
Not open for further replies.

Suraj143

Active Member
I have setup MAX232CPE with 1uF capacitors.When I switch off power & repower it won't work.When I remove the max232 & replace it to the same IC base its working.

Is this is a capacitor error?
 

MaxHeadRoom78

Well-Known Member
I have found that the MAX232 is fairly flexible AFA cap value is concerned, did you do a voltage check on the pins when it fails, or compare the two conditions?
Max.
 

Suraj143

Active Member
Hi thanks for the reply.I have done a bad thing don't know somebody has done this before..

In MAX232 there are two line drivers.I have tied (T1IN) permanently to Gnd so (T1out) is always 12V.

Is this good to permanently tie the one of drivers to make it 12V out?

I have done this because I need 12V to make this unit as a DTR.
 

MaxHeadRoom78

Well-Known Member
That should be OK if you need a DTR signal.
You can also just jumper out the hardware handshake lines. See the D9 plug.
Max.
 

dr pepper

Well-Known Member
Most Helpful Member
Do you have a capacitor across the supply rails, you need one.
Have you used good quality capacitors.
And are they still ok, a leaky cap can mess things up.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top