When a MOSFET or IGBT gate-threshold voltage is higher than the available drive voltage, it's standard to use an op amp or other driver to bridge the difference. This circuit uses a basic. Precision op amps (Vos.

Mosfet Operational Amplifier

The CA3240 IC is an operational amplifier consisting of two op-amps integrated in a single IC. Its internal structure is comprised of both bipolar transistors and Mosfet. Moreover, it supports Mosfet type input and bipolar output. This P-channel Mosfet in the input circuit allows high impedance and a wide range of common-mode input voltage. Led edit 2018 app download.

Comments

• edited 2002-10-23 18:25

  A CA5160 would work - Try Jameco or BG Micro for onesies,
  older stuff. Two straight lines is a non-polarized cap.
  The curvy line usually denotes the negative side of a
  polarity-sensitive cap.
  Jack
  ghidera2000 wrote:
  >
  > Gathering parts for my next experiment (Tracy Allan's pH
  > transmitter). The CA3160 isn't available locally. I can't seem to
  > find a cross-reference or even a datasheet for it online.
  >
  > Active components has three mosfet op-amps in thier catalog but not
  > stocked in store. Meaning I have to buy 50 or so at once.
  >
  > Any equivilent parts I can go looking for at other stores that you
  > folks know of?
  >
  > Oh and one other newb question. In the drawing there are two
  > different symbols for capacitors. One is two parallel lines and the
  > other is the same but the ends of one line are turned down. What is
  > the signifigance of that?
• edited 2002-10-23 21:02

  >Gathering parts for my next experiment (Tracy Allan's pH
  >transmitter). The CA3160 isn't available locally. I can't seem to
  >find a cross-reference or even a datasheet for it online.
  I still have a pile of those old RCA op amps lying around, but they
  are really dated. Don't go out and purchase any! I never use them
  for anything any more, so let me know if you want one in trade for a
  couple of stamps.
  The important parameter for a pH amplifier is low input bias current,
  so a CMOS input is essential. There are a lot of op amps today that
  would work.
  The National LMC6081 would be a good substitution. You can get free
  samples from National, or purchase them from Digikey etc.
  The LMC6081 has a typical input bias current of 10 femtoamperes.
  (femto=ten to the minus 15th power). pH electrodes are like a small
  battery outputting a voltage on the order of +/-1 volt, but in series
  with a very large and unstable 'source resistance', say 10 to 100
  megaohms. What you want to get at is the voltage. The op amp bias
  current flowing through that resistance causes an error. 10 femto
  amperes through 100 megaohms causes negligible error, less than a
  microvolt. But if you were to use a general purpose op amp with, say
  1 nanoamp bias current (10E-9), then the error could be 0.1 volt,
  which is not negligible at all.
  -- best regards
  Tracy Allen
  electronically monitored ecosystems
  http://www.emesystems.com
  mailto:tracy@e..
  >
  >Active components has three mosfet op-amps in thier catalog but not
  >stocked in store. Meaning I have to buy 50 or so at once.
  >
  >Any equivilent parts I can go looking for at other stores that you
  >folks know of?
  >
  >Oh and one other newb question. In the drawing there are two
  >different symbols for capacitors. One is two parallel lines and the
  >other is the same but the ends of one line are turned down. What is
  >the signifigance of that?
• edited 2002-10-24 00:15

  >in trade for a
  >couple of stamps
  not Stamps, just stamps, you know what I mean?!
• edited 2002-10-24 00:35

  --- In basicstamps@y.., Tracy Allen <tracy@e..> wrote:
  > >in trade for a
  > >couple of stamps
  >
  > not Stamps, just stamps, you know what I mean?!
  Hehe, two Javelin stamps for the OpAmp what? [noparse]:D[/noparse]
  Thanks for the offer! I'll keep attempting to find something locally
  for now. If I build it and later have to repair, I would rather have
  something I can pop down to the corner and purchase a replacement for.
  Besides, you KNOW the day after you mailed it off, something would
  break and you'd need one - and it'd be something vital like a sump
  pump controller that kept your basement from flooding with sewage (At
  least, thats the way it always seems to happen for me).
• edited 2002-10-24 19:43

  Heh, couldn't find the alternate chip but it turns out Intek has a
  buttload of the CA3160's in Victoria - receiving four of them
  tomorrow. Only $2 each so I got two extras. [noparse]:D[/noparse]

Hi all,

First post in the community, so forgive me if I’m in the wrong place. I’m looking to build a battery discharge cycle tester to determine how fast certain devices drain batteries. I’m planning to use an Arduino Zero to command the system, but I’m unsure of which exact circuit configuration and components would best suit my needs. The system will basically act as a programmable DC electronic load that can be varied during each cycle (ex: draw 20 mA for 3 mins, then 60 mA bursts for 1 min, then off for 5 mins, and repeat). I also need to be able to continuously measure the voltage of the battery pack to stop the test if a prescribed low voltage limit is reached, to simulate the voltage being too low to power the theoretical device.

Fleetwood mac rumours font download. I’m fairly familiar with how everything works, but I don’t have a ton of experience with circuit design so I could use some advice. I’ve found two example circuits on YouTube (pics attached), but there’s some variation between them. If I’m going to be working with a max battery voltage of 12V and have to draw a max current of roughly 300mA, but be able to accommodate as low as 1.5V and 0A, which circuit would work better? And what Op Amp(s) and MOSFET would be a good choice? I’m hoping to use a single supply Op Amp that the Zero can power, but I can figure out another solution if this can’t happen.

Jfet Op Amp

Please let me know if there’s any important info you need that I left out. Thank you so much in advance!