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NTE834 comparator output voltage




 
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Author Topic: NTE834 comparator output voltage  (Read 393 times)
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ka1tdq
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« on: September 19, 2018, 09:42:54 AM »

I'm using the NTE834 comparator chip for something, but the positive output voltage is 1.7 vdc when it switches and I'm wanting 5 vdc.  I have a 5 vdc supply to the ship and ground is connected to -VCC.  It is switching properly, because when the input to the (-) pin is 5 vdc the output goes to zero.  2.5 vdc is my reference voltage to the (+) pin.  It is configured as an inverting comparator.

I need the output to drive other TTL logic, so I need 5 volts output.  Datasheet is attached.

Jon

* nte834.pdf (34 KB - downloaded 20 times.)
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ka1tdq
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« Reply #1 on: September 19, 2018, 10:34:37 AM »

I think I found my answer. I need a pull-up resistor on the output.

Jon


* D62F02F5-26E2-4D55-9589-9CA1708EEB1E.png (371.02 KB, 1125x2436 - viewed 54 times.)
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ka1tdq
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« Reply #2 on: September 21, 2018, 11:04:42 AM »

Just for ha-ha’s, here’s the finished product. I also needed pull-up resistors on the buffer chip right before the FETs. It’s a logic board for something at work. An Arduino or a Raspberry Pi would’ve been more elegant, but this requires no programming.

Jon


* E101C6C5-D9B0-4282-89EC-9C080A95F5DD.jpeg (2219.2 KB, 4032x3024 - viewed 53 times.)
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W2PFY
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« Reply #3 on: September 22, 2018, 03:21:01 PM »

Kewl!!!  Do you have a larger picture of your avatar? Inquiring minds need to see  Cheesy Cheesy Cheesy
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The secrecy of my job prevents me from knowing what I am doing.
ka1tdq
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« Reply #4 on: September 22, 2018, 04:20:08 PM »

Here


* EC184D74-010B-4061-9410-4F6C4BC25693.jpeg (1205.12 KB, 1536x2048 - viewed 50 times.)
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w4bfs
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« Reply #5 on: September 22, 2018, 05:51:31 PM »

gives a whole new meaning to the term busted .... nice Jon, I'll bet you go peacefully
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Beefus

O would some power the gift give us
to see ourselves as others see us.
It would from many blunders free us.         Robert Burns
ka1tdq
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« Reply #6 on: September 22, 2018, 07:35:47 PM »

Being a ham is sexy.
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