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Legacy Personal Blogs OAG001 Op-Amp Amplifier and Filter Prototype PCB
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Engagement
  • Author Author: peterjcs23
  • Date Created: 25 Apr 2016 1:13 PM Date Created
  • Views 2686 views
  • Likes 5 likes
  • Comments 10 comments
  • sallen-key
  • ardouino
  • op-amp
  • amplifier
  • op amp
  • raspberry pi
  • sot23-5
  • filter
  • prototyping_boards
  • bread_board
Related
Recommended

OAG001 Op-Amp Amplifier and Filter Prototype PCB

peterjcs23
peterjcs23
25 Apr 2016

I never find it easy to build op-amp prototypes using surface mount components. One can buy an adapter PCB that converts SM to through hole pins compatible with 0.1inch breadboards or prototype boards. But it is still difficult to wire up the resistor and capacitor networks and the decoupling capacitors in order to achieve the performance of a PCB.

 

So I've designed a generic amplifier/filter board for surface mount components that can be fitted to a 0.1inch grid compatible with Arduino or Raspberry Pi breakout boards. The circuit can be configured as an inverting, non-inverting or differential amplifier; filter capacitors can be added or set up as a Sallen-Key filter. The amplifier can be powered from single or dual rail supplies.

 

This is the circuit:

image

 

The Op-Amp U1 has a SOT23-5 footprint that is compatible with many single op-amps such as  LM7321, LMC7101, OPA348, TLV271, MCP6001, MCP601, MCP6L71, MCP6L01, AD8613, LT6003 etc.

image

LM7321 is a favourite of mine as it can drive long wires without instability making it suitable as a remote buffer for sensors or analog drivers. The OPA192 is an excellent chip for precision measurements.

OPA192IDBVR TEXAS INSTRUMENTS, Operational Amplifier, Single, 1 Amplifier, 10 MHz, 20 V/µs, 4.5V to 36V, ± 2.25V to ± 18…

LM7321QMFE/NOPB TEXAS INSTRUMENTS, Operational Amplifier, 1 Amplifier, 20 MHz, 18 V/µs, 2.5V to 32V, SOT-23, 5 Pins | Fa…

 

I may have some spare PCBs if anyone wants to try out a project; let me know in the comments.

 

I might also make them for sale if there is enough interest

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Top Comments

  • D_Hersey
    D_Hersey over 9 years ago +1
    These circuits are so useful! Even better with some 'wire-wrap' area to set up things like voltage references. Not to be 'that guy,' but I observe that AD boards of this type throw in shunt caps on the…
  • michaelkellett
    michaelkellett over 9 years ago +1
    I long ago gave up attempting lash up prototypes of op-amps or anything else - some people still do wonders with dead-bug (ing) or birds' nests but I go straight to a real board (if analogue often preceded…
  • michaelkellett
    michaelkellett over 9 years ago in reply to peterjcs23 +1
    Wouldn't it be nice if there were a standard way of op amp data being presented - so that every one told you things like THD or input noise current etc. Both these parts are made by TI - but you still…
  • peterjcs23
    peterjcs23 over 9 years ago in reply to michaelkellett

    Michael, you asked about HV protection. I've have been using these protection diodes from TI as well as some series resistance...

     

    TPD4E1B06 | High Performance TVS Diodes | ESD Protection Diodes | Description & parametrics

     

    PCS.

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  • michaelkellett
    michaelkellett over 9 years ago in reply to peterjcs23

    I glad it was useful.

     

    I've been using lots of them lately.

     

    MK

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  • peterjcs23
    peterjcs23 over 9 years ago in reply to michaelkellett

    Michael, yes a standardised op-amp datasheet would be great. One day there will be the "perfect op-amp" and we won't have to search through hundreds of them for the perfect match of characteristics!

     

    I like your OPA192 very much and have proposed to use in in an upgrade for a current sensor I designed 12 years ago. The OPA4194 will be an excellent choice for low offset and wide operating temperature range. Thanks for the tip.

     

    Peter

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  • D_Hersey
    D_Hersey over 9 years ago in reply to michaelkellett

    That's largely true for me as well when I am not just kickin' it, showin' stuff to the grandkids.  But I never made it a formal decision. I like to be able to get stuff done on a Sunday if I am just foolin' around.  If I am just lashing an LED to a proto-board or something like that, proto can be a good way to go.

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  • D_Hersey
    D_Hersey over 9 years ago in reply to peterjcs23

    I do, I got a lotta surplus w/w kit from ebay for a song.  I know that it is tres-retro.  I think that just a little prototyping area is useful.  Sometimes I put in some at 0.1" pitch and then some at 0.05" pitch.

     

    Wire-wrap done rightly is fairly reliable.  During the Apollo program NASA shook up some w/w boards aside some PC boards.  The w/w boards did not fail at a higher rate and thus were allowed to fly.

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