Author Topic: Assembled 2N3906-transitor based temperature sensor  (Read 1528 times)

0 Members and 1 Guest are viewing this topic.

Offline prasimixTopic starter

  • Supporter
  • ****
  • Posts: 2037
  • Country: hr
    • EEZ
Assembled 2N3906-transitor based temperature sensor
« on: January 26, 2019, 04:50:45 pm »
I'm wondering if anyone is aware of ready-made (assembled, ready for mounting) 2N3906-transitor based temperature sensor, i.e. that is not intended for PCB temperature measurement, but as standalone sensor that can be mounted somewhere inside enclosure. I'd like to use it with I2C fan controller. Ideally, it has to be similar to this one but with transistor instead of NTC. Thanks in advance.

Offline nsrmagazin

  • Regular Contributor
  • *
  • !
  • Posts: 156
  • Country: ru
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #1 on: January 27, 2019, 07:11:14 am »
Whats wrong with using LM335? Its used for batteries and power supplies.
Hi all!
If you like the post, please press "thanks".
 

Offline prasimixTopic starter

  • Supporter
  • ****
  • Posts: 2037
  • Country: hr
    • EEZ
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #2 on: January 27, 2019, 07:16:25 am »
Nothing is wrong with LM335, but I need external sensor that is going to be connected to I2C fan controller that is expecting 2N3906 "diode" temperature sensor. I'd like to skip soldering of mentioned part to the wires and connector but looking if such assembled solution exists.

Offline zitt

  • Regular Contributor
  • *
  • Posts: 113
  • Country: us
    • Pinball-Mods.com
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #3 on: January 31, 2019, 09:07:55 pm »
Confused... it's three pins soldered in a diode configuration (IE two wires).
I don't see any value in complicating that. It's intended to be "easy".
Just make a quick PCB with a 2pin connector and the 3pin transistor and wire it. Done.

What am I missing?
 

Offline mvs

  • Frequent Contributor
  • **
  • Posts: 370
  • Country: de
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #4 on: January 31, 2019, 09:58:52 pm »
Just make a quick PCB with a 2pin connector and the 3pin transistor and wire it. Done.
What am I missing?
Its too much effort... I would use some BJT in TO-126 package (like BD-139) and solder wires directly to pins.
 

Offline prasimixTopic starter

  • Supporter
  • ****
  • Posts: 2037
  • Country: hr
    • EEZ
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #5 on: January 31, 2019, 09:59:31 pm »
You're just missing a quantity: try to do that few hundred times, together with making cable assembly :).

Offline prasimixTopic starter

  • Supporter
  • ****
  • Posts: 2037
  • Country: hr
    • EEZ
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #6 on: January 31, 2019, 10:00:37 pm »
Just make a quick PCB with a 2pin connector and the 3pin transistor and wire it. Done.
What am I missing?
Its too much effort... I would use some BJT in TO-126 package (like BD-139) and solder wires directly to pins.

Yeah, that is much convenient then SMT part, and it already has a mounting hole.

Offline Yansi

  • Super Contributor
  • ***
  • Posts: 3930
  • Country: 00
  • STM32, STM8, AVR, 8051
Re: Assembled 2N3906-transitor based temperature sensor
« Reply #7 on: January 31, 2019, 10:05:44 pm »
I don't see anything particularly complicated on hand-assembling a panel of 100   SOT23 transistor plus 100 connectors.  That is  just 200 components.  Way less than some single-unit test PCBs I am used to hand assemble (500 components on a single board). 

Quick search turned nothing, so I would go down the route of having a custom PCB panel made, probably it could even be extremely cheap to get assembled using the JLCpcb service.

You could even get custom cable assemblies crimped and prepared. There are cheap enough services for that already available for bargain.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf