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Project ideas for LM158H Dual Op-Amp

DSC_1539 I just made a lucky find in my piles of junk. I have about 175 LM158H Low Power Dual Operational Amplifiers in the TO-99 package. I will be placing some in lab stock here at uCHobby and may include some in TGIMBOEJ shipments but I would like to do some projects with this part. Maybe even layout a board to make 100 kits useful for the electronics hobbyist.

The TO-99 package has 8 long gold plated leads in a circular pattern and a metal can. About 1/4 the size of a US Dime. The white plastic piece you see in this picture is just packing to protect the device legs.

One idea is to make a general purpose Op-Amp protoboard adaptor. Like the other breadboard adaptors I have done in the past. Maybe a sine wave oscillator or a microphone preamp. There are a lot of possibilities.

LM158H Design Contest
Comment with your ideas for a reusable kit. Something that a hobbyist can use as part of other projects or as a stand alone device. I may build your idea into a kit. The top three ideas will receive a free kit of what ever we come up with, assuming we take the next step.

Help me make use of these old electronics parts so they don’t end up in the trash pile. They are nice parts, selling for around $5/each so surely we can find something useful for them to do.

More Information

Information at National for the LM158. This includes an online tool for designing amps and filters with the part.

Design of Op Amp sine wave oscillators PDF from TI

 

pinout

 

Comments Please
What should we make with these?

Posted in Contest, Discovering, Ideas, Parts, Projects, Scrounging, Scrounging Parts.

12 Responses

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  1. I would suggest an “tengu”-kind Arduino shield. This would include the 158, electret mic and the additional components for the amplifier, and also a small speaker (which can be turned on/off through software). The analog output from 158 (0-5V) would be connectible to Arduino analog pins 0-3.
    The shield would be powered by 5V from Arduino.
    Main applications would be Tengu.

  2. I am all for going with a preamp type idea, but why not make it the preamp for an arduino synthesizer project. maybe it could help make more palatable sounds from a Arduino output.

  3. 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.

  4. 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.

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

  6. Berni said

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

    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.

    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.

  7. Kevin said

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

  8. john said

    Multiple waveform signal generator would be great.

  9. They are low power, so a logic probe:

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

  10. Berni said

    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 5x5mm board

  11. 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.

Continuing the Discussion

  1. TGIMBOEJ Code Named uCHobby2 Ready | uC Hobby linked to this post on August 20, 2009

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