Adding a LED to switch ON when Vin is within window?

[atferrari]

I am about to test a circuit including this integrator and decided to add a LED turning on when Vin is within window.

The actual Vwin (comparator's output) is quite close to what LTSpice predicts.

Remaining space in the crowded board, allows just a TO92 and few resistors. All what I tried with BJTs created problems to the integrator or did not work.

Could anyone come with an effective design? I spent one full journey trying in LTSpice because I do not dare to rsik the only two pairs of JFETs I got (2 x 2N5461 Pchannel + 2 x J310 N channel).

Please note: I need to add a LED and NOT to modify the integrator.

Just in case I am adding the .asc file plus model and subckt

Gracias for any ideas.

 

[ericgibbs]

hola at,
Do you have PCB space for this option.?
Eric

 

[atferrari]

hola at,
Do you have PCB space for this option.?
Eric

Sure I have Eric. And such a simple solution.

Struggled trying to use BJTs and then the 2N5461 when I had many 2N7000 handy...

Gracias!!

 

[simonbramble]

what about FIG 1 of the LTC6700 datasheet (page 15):
http://cds.linear.com/docs/en/datasheet/6700123fh.pdf

 

[atferrari]

what about FIG 1 of the LTC6700 datasheet (page 15):
http://cds.linear.com/docs/en/datasheet/6700123fh.pdf

Hola Simón,

The circuit is already implemented with a TL074. Thanks.