Re: 1.5v src, LED needs 3v, now what?

 
"Chris" <cfoley1064@xxxxxxxxx> wrote in message news:1113024996.784822.203580@xxxxxxxxxxxxxxxxxxxxxxxxxxxx...

Lord Garth wrote:
>
> Chris, Are those connection dots between the ref amp output and the
> power rails?  Looks like a short across the battery to me.  The 7 and
4
> pin numbers are probably misplaced as well.

Thanks.  Possibly this will get through unmunged:
'           ___       ___
'     ..----|___|---o-|___|----------------------|<------->
'     |    330K    |  100 ..-----------------. 1N4001    To
'     |            |      |                 |        Flasher
'     |            |      |                 |
'     |   ..--------o------o------------.    |
'     |   |        |6     |8          7|    |
'     |   |OpAmp.--|------|-----o------o----|--------.
'     |   |     |  |      |     |      |    |        |
'     |   |2  |\|  |      |   |\| Ref  |    |        |
'  .--|---o---|-\  |      '---|-\ Amp 1|    |200mV  +|
'  |  |   |   |  >-' LM10     |  >-----o----o       ---
'  |  o---o---|+/         ..---|+/      |    |        -
'  |  |   |3  |/|        +|   |/|      |    |        |1.5V
'  |  |   |     |        ---    |      |    |        |
'  |  |   |     |   200mV -     |      |    |        |
'  |  |   |     |    Ref  |     |      |    |        |
'  |  |   |     '---------o-----o------o----|--------'
'  |  |   |                           4|    o----.
'  |  |   '----------------------------'    |    |
'  |  |                                    ..-.   |
'  |  |                                 10K| |   |
'  |  |                                    | |   |
'  |  |                                    '-'   |20K
'  |  |                                     |   .-.
'  |  '-------------------------------------o   | |<---.
'  |                                        |   | |    |
'  |                                       ..-.  '-'    |
'  |                                 Sensor| |   |     |
'  |                              2K to 64K| |   |     |
'  |                                       '-'   |     |
'  |                                        |    |     |
'  |                                       GND  GND    |
'  '---------------------------------------------------'
'
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

The LM10 has a bit of an unusual pinout:
Pin 1  Reference output
Pin 2  OpAmp - Input
Pin 3  OpAmp + Input
Pin 4  (Batt -)
Pin 5  Balance (unused)
Pin 6  OpAmp Output
Pin 7  (Batt +)
Pin 8  Reference Amp Feedback

In the diagram, Pin 8 is tied to Pin 1 for a ref amp voltage follower,
which would give 200mV Vref for the VDVR and the pot.  Pin 7 is
connected to the battery +.  I showed the internal "power connections"
of the LM10 like on the appnote, instead of just pinouts.  Just focus
on what's going on outside the LM10 box (bubbles indicate pins).
Battery + (Pin 7) and Reference Output (Pin 8) are not connected
together here.

Thanks for the note.  It seems Google munges ASCII art sometimes no
matter what.  I don't mind it apart from that, but I used to post from
AOL groups.  If it were a choice between AOL groups and a jammed
teletype machine with a spool of torn tape spewed all over the floor,
I'd have to think 'er over.  Possibly I should chip in for a
store-bought newsreader and write off the monthly fees ;-)

Chris
 
Here's my edit on the circuit

'           ___       ___
'     ..----|___|---o-|___|----------------------|<------->
'     |    330K    |  100                      1N4001    To
'     |            |                                 Flasher
'     |            |                        
'     |   ..--------o------o------------.    
'     |   |        |6     |8    7      |    
'     |   |OpAmp.--|------|-----o------|-------------.
'     |   |     |  |      |     |      |             |
'     |   |2  |\|  |      |   |\| Ref  |             |
'  .--|---o---|-\  |      '---|-\ Amp 1|  200mV     +|
'  |  |       |  >-' LM10     |  >-----o----o       ---
'  |  o-------|+/         ..---|+/      |             -
'  |  |3      |/|        +|   |/|      |             |1.5V
'  |  |         |        ---    |      |             |
'  |  |         |   200mV -     |      |             |
'  |  |         |    Ref  |     |      |             |
'  |  |         '---------o-----o------|-------------'
'  |  |                         4      o----.
'  |  |                                |    |
'  |  |                               .-.   |
'  |  |                            10K| |   |
'  |  |                               | |   |
'  |  |                               '-'   |20K
'  |  |                                |   .-.
'  |  '--------------------------------o   | |<---.
'  |                                   |   | |    |
'  |                                  ..-.  '-'    |
'  |                            Sensor| |   |     |
'  |                         2K to 64K| |   |     |
'  |                                  '-'   |     |
'  |                                   |    |     |
'  |                                  GND  GND    |
'  '----------------------------------------------'

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