#1153

Рет қаралды 8,601

IMSAI Guy

2 жыл бұрын

Episode 1153 chip of the day
F to V in an 8 pin dip
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Пікірлер: 44

@robertmiller2878 2 жыл бұрын

I designed that product as a design engineer at National Semiconductor in 1974. I was designing custom automotive ICs, and this was my first 'non-custom' general application device; it was an offshoot of a anti-skid brake controller I worked on for Bendix/Ford. In no possible way could we have predicted this device would last and sell as many as it did! I presented it and its possible applications in a paper delivered at the first SAE/IEEE Convergence Conference at Cobo Hall, in Detroit, in 1975.

@IMSAIGuy 2 жыл бұрын

Good job!

@guilldea 2 жыл бұрын

Wow, 2.6k views and one of those was the designer, what are the chances!

@robertmiller2878 2 жыл бұрын

@@guilldea Its a great channel!!

@IMSAIGuy 2 жыл бұрын

@@guilldea at least 2600:1 😎

@lohikarhu734 2 жыл бұрын

Robert, when were you last working at NSC? I worked with Grass Valley guys, and Oulu, 2005-2011... I guess that you knew that "character" with the big beard, and VE beetle?

@qzorn4440 3 ай бұрын

The LM2907 and a magnetic pickup sensor are fantastic. The sensor will take a hot greasy locations similar to car engines. Where expensive encoders will fail. 😎 Great video. Thanks.

@jj74qformerlyjailbreak3 2 жыл бұрын

Nifty little chip. I’d like to have some of these actually. Thanks for Introducing me to it. God Bless.

@lohikarhu734 2 жыл бұрын

These "LM" and "LP" devices come from National Semiconductor, so they have quite different data sheets from TI "original" devices... I had the privilege of working with design teams from TI, NS, AMS, Fairchild, ADI; interesting times!

@YanickT 2 жыл бұрын

Thank you for doing this, very interesting and can be very handy. Have a good day.

@jeffreymorris1752 6 ай бұрын

Just got a schematic where the LM2907 is used in a very accurate guitar tuner.

@LapsetoTime Жыл бұрын

tankuu for hands on this IC

@AnalogDude_ 2 жыл бұрын

cool find!

@TonyRule 2 жыл бұрын

I have zero use for anything like this but damned if I'm not looking really hard to try and find one!

@jacobboth1438 2 жыл бұрын

Back in the eighties I built a fax/slowscan converter for the Amiga 500 using the LM2907 in conjunction with an ADC0804 (ao). PE1LLA

@EngineeringVignettes 2 жыл бұрын

Jellybean IC's like these are fun. The old RadioShack handbooks (Mims) were full of them. Next in the list would be a tone decoder? Maybe some DTMF demo :) Cheers,

@IMSAIGuy 2 жыл бұрын

I already did a bunch of those. search my channel for DTMF

@BaldurNorddahl 2 жыл бұрын

Interesting. I would have counted the pulses either directly with an interrupt to the microcontroller or with an external counter that can be polled.

@RobRoschewsk 2 жыл бұрын

This offloads the microcontroller so all you need is a generic A/D pin and no fancy timing

@BaldurNorddahl 2 жыл бұрын

@@RobRoschewsk many microcontrollers, for example the Raspberry Pi RP2040, have programmable digital pins so you can simply implement an offloaded counter on a pin. Another way would be an external counter such as 74HC590 which admittedly uses more pins unless connected to a bus. There is many ways to go around things. My thinking is just that I would avoid converting something digital to analog just to use an ADC to convert it back to digital. Just keep it digital which is also more precise. I would only think of this chip if I was designing a purely analog circuit. For example if you wanted to drive an analog meter with counted pulses. Not saying it would be wrong to use in any other context, but just that is how I am thinking.

@Gengh13 2 жыл бұрын

Most uC today have timers that can be put in a counter mode.

@Bianchi77 2 жыл бұрын

Creative video, thanks for sharing, like it :)

@thevideoboy87 2 жыл бұрын

nice video !! however I think you wanted to say F to V at 4:02 ... you said V to F :-) maybe an idea for another video VCO ?

@ElectronoobGeekingOut 2 жыл бұрын

i wonder if it would demodulate FM

@mcmurtr79 2 жыл бұрын

When are you going to cover the LM399 you had on your board off to the side when discussing some references earlier. Would like to hear your thoughts on the classic LM399 vs the new ADR1399 also.

@IMSAIGuy 2 жыл бұрын

June 7th

@user-cf7be9km5m 2 жыл бұрын

Is it possible to make an analog speed regulator based on the LM2907 feedback principle?

@IMSAIGuy 2 жыл бұрын

absolutely

@t1d100 2 жыл бұрын

Kewl

@user-ix8zy5nf3z 2 ай бұрын

LM2907 vsLM331

@Enigma758 2 жыл бұрын

Let's see, your sine wave signal is AC coupled and the chip is powered with a single ended supply. I suppose that means that the bottom half of the sine wave is ignored.

@IMSAIGuy 2 жыл бұрын

no not at all, the chip can DC bias it's input to any voltage it wants. I don't know the internal design. oh, just looked at the datasheet, shows the circuit, it has a bias section and the input is actually a Schmidt trigger

@simontay4851 2 жыл бұрын

@CodeJeffo 2 жыл бұрын

Next time voltage to frequency please :)

@IMSAIGuy 2 жыл бұрын

A VCO converts voltage to frequency: kzfaq.info/get/bejne/hp6RmtKkzd-XeGg.html search my channel for 'VCO' I have other videos

@peterrhodes5663 Жыл бұрын

Just bought 5x LM2917N's from China. 14 pin dil ones.That's the LM2907 but with an inbuilt voltage regulator, except that it wasn't there. Fake chip. Beware! Got a refund.