Can''t get op-amp (LM358) to work.
Archiver
Posts: 46,084
Subhrajit,
I bet you have it wired wrong if both sides don't work. Those chips are
pretty tough and hard to blow. It could be bad, but I suspect operator
error. That's what it always is with me!
Jonathan
www.madlabs.info
Original Message
From: <subhrajitb@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, January 31, 2003 7:51 PM
Subject: [noparse][[/noparse]basicstamps] Can't get op-amp (LM358) to work.
> Hello,
>
> I am new to this embedded control stuff, and I am working on my own.
> And I have this problem.... I am working with the Industrial control
> book, and I am trying to implement the 1st ckt in chapter 2.
>
> The LM358 has it's input tied to a phototransistor whose voltage is
> switching between 4.77 and 4.13 V (measured using multimeter). The
> reference voltage is around 4.52 V. The output of the op-amp remains
> unchanged at around 3.7 V. I tried both the op-amps in the LM358.
> No luck.
>
> Is the chip bad ? Is there something I should try before getting a
> new chip ?
>
> Thanks a lot.
> Subhrajit
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
I bet you have it wired wrong if both sides don't work. Those chips are
pretty tough and hard to blow. It could be bad, but I suspect operator
error. That's what it always is with me!
Jonathan
www.madlabs.info
Original Message
From: <subhrajitb@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, January 31, 2003 7:51 PM
Subject: [noparse][[/noparse]basicstamps] Can't get op-amp (LM358) to work.
> Hello,
>
> I am new to this embedded control stuff, and I am working on my own.
> And I have this problem.... I am working with the Industrial control
> book, and I am trying to implement the 1st ckt in chapter 2.
>
> The LM358 has it's input tied to a phototransistor whose voltage is
> switching between 4.77 and 4.13 V (measured using multimeter). The
> reference voltage is around 4.52 V. The output of the op-amp remains
> unchanged at around 3.7 V. I tried both the op-amps in the LM358.
> No luck.
>
> Is the chip bad ? Is there something I should try before getting a
> new chip ?
>
> Thanks a lot.
> Subhrajit
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>