Please tell me some good op amp ics for ultrasonic receiver

Sir
Please tell me some good op amp ics for ultrasonic receiver circuits
Thank u
Mahesh

what do you mean? you want to amplify it?

Re: Please tell me some good op amp ics for ultrasonic recei

ya i want to amplify the signal from ultrasonic receiver.

Thank you

It depends how good you need it to be i.e. how small a signal you need to be able to detect. For the ultimate receiver you would look for a low noise opamp, possibly with a JFET input. For general purpose use, and high impedance input one will do. Ideally you want high impedance because ultrasonic transducers are usually piezo based, but I am sure plenty of useful circuits have been made with the LM324 or something similar.

Try searching google for "ultrasonic receiver" - there are thousands of examples.

Keith

The LM324 and LM358 have very poor high frequency gain and output.
There are many much better and newer opamps.

Re: Please tell me some good op amp ics for ultrasonic recei

Audioguru said:

The LM324 and LM358 have very poor high frequency gain and output.
There are many much better and newer opamps.

Click to expand...

Very true, but depending on how much gain is required from each stage and the bandwidth required they may be adequate.

Keith

The LM324 and LM358 have trouble with frequencies above only 2kHz. The TL07x and many others (MC3407x) work well up to 100kHz.

Ultrasonic frequencies (required in this thread) are much higher than only 2kHz.

If you cannot get the LM324 to work above 2kHz you are doing something wrong! Their bandwidth is around 1MHz, as far as I recall.

Keith

Re: Please tell me some good op amp ics for ultrasonic recei

keith1200rs said:

If you cannot get the LM324 to work above 2kHz you are doing something wrong! Their bandwidth is around 1MHz, as far as I recall.

Keith

Click to expand...

The LM324 is the first low power opamp. Low power means low performance.
At 1MHz and with a high supply voltage its voltage gain is 1 like a piece of wire. At lower supply voltages its voltage gain is 1 at about 400kHz.
It has severe crossover distortion.
But is output is slew-rate limited so cannot swing above 20Vp-p above 2kHz. Most other opamps can swing their outputs at 27Vp-p up to 100kHz and have a voltage gain that is fairly high at 1MHz.

Re: Please tell me some good op amp ics for ultrasonic recei

I could only attach a single file. Here is the LM324 crossover distortion file:

Re: Please tell me some good op amp ics for ultrasonic recei

Try with AD811.
Already used without any problem
Video amplifier; very good.

Mandi

Re: Please tell me some good op amp ics for ultrasonic recei

I didn't realise the original poster was trying to get 20V P-P output swing. I thought it was for an ultrasonic amplifier. My mistake


NOT.

Also, if you read my original post I said:

keith1200rs said:

It depends how good you need it to be i.e. how small a signal you need to be able to detect. For the ultimate receiver you would look for a low noise opamp, possibly with a JFET input. For general purpose use, a high impedance input one will do. Ideally you want high impedance because ultrasonic transducers are usually piezo based, but I am sure plenty of useful circuits have been made with the LM324 or something similar.

Try searching google for "ultrasonic receiver" - there are thousands of examples.

Click to expand...

and I am sure there are. No connection to me, in spite of the name, but here is one:

**broken link removed**

Here's another:

www.paia.com/KRUKits/K49/K49.pdf

I am sure there are thousands more.

Personally, I would recommend something else provided the original poster has reasonable access to a range of devices. Some people don't - hence they are still using the 741.

If you would like to post more details of your requirements, Mahesh, I would be able to give specific recommendations. Gain, noise, type of sensor and power supply requirements would be useful to know.

I have designed a battery operated ultrasonic amplifier/filter with switchable gain using the LT6234 for low noise and the LMV654 to give 16 poles of filtering at low power but that was for 3.3V operation with a MEMS microphone so those opamps may not be suitable for your application.

Keith.