need a low noise op amp similar to the TL082. It must have similar
gain, but I need lower power consumption, lower noise and a single
supply chip (low Vcc preferred).

It must be available in a DIP package.

Any suggestions?

TIA

A

Albert writes:

need a low noise op amp similar to the TL082. It must have similar
gain, but I need lower power consumption, lower noise and a single
supply chip (low Vcc preferred).

It must be available in a DIP package.

Do you need the same high-Z JFET type inputs? There are so many op-amps
out there that you'll have to be a bit more specific in your requirements.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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On Sat, 26 Mar 2005 13:31:39 -0500, Albert wrote:

need a low noise op amp similar to the TL082.

LM6142
AD822
OP275


--
Jeg kan virkelig ikke se, hvad det skulle betyde, at forbinde en 0,1 mm X 1
mm tin-fyldt kobberbane i ét apparat med en anden 0,1 mm X 1 mm tinfyldt
kobberbane i et andet apparat, via et sølvbelagt 4 mm2 polafhængigt
højteknologisk kulfiberinfiltreret kabel til et astronomisk beløb.

Tro flytter ikke bjerge. Tro flytter kroner.

Hi Sam, good to hear from you.

The project is a VLF single frequency receiver, an improved version of
the one at:

http://www.aavso.org/observing/progr.../easySID.shtml

About half way down the page is a gif, click on it to see the full
schematic.

I am interested in receiving signals at 17 kilohertz, which are
radiating from a transmitter in the house. The transmitter is low
power, as supplied by the manufacturer, it has a 90 foot range (with
the manufacturers companion (black box) receiver. The transmitting
antennas are 6 inch air coils with hundreds of turns of fine gauge
wire, which is driven by an audio amp chip with the input frequency
fixed at 17 kilohertz.

The manufacturers companion receiver runs on very expensive single
source batteries that don't last long AND it doesn't have enough range
to start with!

I want to use cheap laser pointer batteries, or small nicad button
cells, which are a little pricey initially...but they pay off about
the 4th time you recharge them::

I DO NOT think the high input impedance is necessary, but usually
fet's and low input bias are associated with low noise op amps.

Regards,

A



Do you need the same high-Z JFET type inputs? There are so many op-amps
out there that you'll have to be a bit more specific in your requirements.

Albert writes:

Hi Sam, good to hear from you.

The project is a VLF single frequency receiver, an improved version of
the one at:

http://www.aavso.org/observing/progr.../easySID.shtml

About half way down the page is a gif, click on it to see the full
schematic.

Certainly not very complicated! Just cascaded X100 gain stages.

I am interested in receiving signals at 17 kilohertz, which are
radiating from a transmitter in the house. The transmitter is low
power, as supplied by the manufacturer, it has a 90 foot range (with
the manufacturers companion (black box) receiver. The transmitting
antennas are 6 inch air coils with hundreds of turns of fine gauge
wire, which is driven by an audio amp chip with the input frequency
fixed at 17 kilohertz.

The manufacturers companion receiver runs on very expensive single
source batteries that don't last long AND it doesn't have enough range
to start with!

I want to use cheap laser pointer batteries, or small nicad button
cells, which are a little pricey initially...but they pay off about
the 4th time you recharge them::

I DO NOT think the high input impedance is necessary, but usually
fet's and low input bias are associated with low noise op amps.

Companies like National, Texas Instruments, Maxim, Linear Technology, etc.
have very good selection guides on-line. They also will supply free samples
and most dual op-amps are pin compatible so you can try a few types if
it turns out to be critical. I doubt that the TL082 was
selected because of some fantastic specification - it was probably in
someone's junk box! You don't need the Hi-Z input and even the low noise
may not be terribly critical, but probably only trying them out will
determine that for sure. Just stay away from really garbage op-amps
like the LM358!

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.