Comments on: Project ideas for LM158H Dual Op-Amp

By: Columbus web design

Columbus web design — Fri, 28 Aug 2009 11:47:09 +0000

I have used opamps in a lot of stuff. One of the interesting uses was a single opmp IR distance sensor that i designed my self from scratch, i can imagine its a very useful thing in robotics as it can sense distance with mm resolution.

By: TGIMBOEJ Code Named uCHobby2 Ready | uC Hobby

TGIMBOEJ Code Named uCHobby2 Ready | uC Hobby — Thu, 20 Aug 2009 05:04:42 +0000

[...] cables, an interesting purple plastic box is loaded with components including some of the LM158H parts I wrote about [...]

By: Berni

Berni — Wed, 05 Aug 2009 06:36:45 +0000

Makes me want to build that logic pobe, the one i use now is simply 3 LEDs and 2 resistors and it works basically the same way but it draws a few mA of current from the tested pin.. I think i have some tiny SMD opamps around to make this in to a tiny 5×5mm board

By: Daniel

Daniel — Wed, 05 Aug 2009 05:23:49 +0000

They are low power, so a logic probe:

http://www.swansontec.com/sprobe.html

By: john

john — Sun, 02 Aug 2009 16:49:21 +0000

Multiple waveform signal generator would be great.

By: Kevin

Kevin — Sun, 02 Aug 2009 16:28:52 +0000

I know it has been said before but a preamp for the arduino would be great. I am always finding I need one .

By: Berni

Berni — Sun, 02 Aug 2009 10:45:43 +0000

Ugh… a opamp has about as many uses as a transistor….filters, amplifiers, signal generators , comparators , feedback ,buffers , line driving…..

As a kit i would imagine it could make a great cheepo signal generator. With opamps and a few passives you can generate sine, square ,saw ,triangle… just about any common waveform.And in my opinion building your own lab equipment is a great thing to do and a signal generator is a pretty basic lab instrument. (one i been thinking of making for some time)

If needed i can design such a kit as i have experience working and designing with op amps. I also did lots of PCBs before.

By: Charles Stutzman

Charles Stutzman — Sat, 01 Aug 2009 21:10:16 +0000

An Op Amp could be used to run motors if set up correctly.

By: Charles Stutzman

Charles Stutzman — Sat, 01 Aug 2009 20:49:09 +0000

More ideas… You could help make a stable non microcontroller operated solar hot water heater. Use a Resistive Thermal Device to control it, and a low set temperature Potentiometer, a high set potentiometer, 5 or so op amps, and some valve solenoids and a small pump. A resourceful person could build the system from scrounged materials for a relatively cheap total cost.

By: Charles Stutzman

Charles Stutzman — Sat, 01 Aug 2009 15:29:41 +0000

Not to flood the comments section… but I just did some more looking at what op amps can do, and I think that using the op amp as an active high pass, an active low pass filter, an active rejection filter, and an audio amplifier using more than one op amp together with all these uses would give you some nicer sounding arduino sound outputs than just a straight frequency out using PWM. a couple of these arrangments could get you some nicer polyphonic synthesizer projects.