The LM LM series are monolithic frequency to voltage converters with a high gain op amp comparator de- signed to operate a relay lamp or other load. uses a charge pump technique and offers frequency doubling for low ripple, full input protection in two versions (LM,. LM) and its. The LM, LM series are monolithic frequency to voltage converters with a high gain op Details, datasheet, quote on part number: LM

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Yeah – I figured that i needed a decent ‘frequency’ I’m guessing the AC input is required to be centered on 0V, incidentally, but a DC blocking cap outside the chip would easily achieve that. Then put a dstasheet resistor to the cathode of D3 and the other end of it to ground.

National Semiconductor

I think you problem lies with the input circuitry of the LM But how does this charge pump do this? Its datasheet is very old and it doesn’t explain function of the IC well.

Andy aka k 10 I created a custom library for this IC and set up my own circuit as datashet in the schematics above.


Ideally, you’re going to need 8 pulses per second minimum, would be better for test purposes. I have then used dataseet datasheet as well as this schematic to convert to 14 pin By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Here’s a datasheett explanation from a digital and software guy who has bumped in to sharp edges in the analog side Therefore to get the chip to do anything you have to take pin 1 above and below this point. By using our site, you ln2917 that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Its driving me nuts Sign up using Email and Password.

Page 1 of the data sheet says it all. The first op-amp is a camparator as your question states. If I pulse 14V onto the “Signal In” port with that powersupply also connected to ground The sig-in line goes from 5.

Can anyone offer some guidance? An example circuit from the datasheet. I guessed the roles of the capacitors completely wrong initially.


National Semiconductor – datasheet pdf

Home Questions Tags Users Unanswered. Then you stand a chance of getting the input to switch. Sign up or log datasbeet Sign up using Google. I’ve built this on a breadboard using a modified version of http: I’ve substantially edited this text to make it more true, see the edit history to see my incorrect babbling if you really want to.

Sign up using Facebook. I’m not game to hook it to my ‘duino nor can I be buggered going out to the bike yet The charge pump is datashee a capacitor which one? I’m hoping someone can take a moment to help me and possible restor my sanity! How are you pulsing the 14V? I would take pin 1 and bias it with two 20K or so resistors going to supply and ground.

I’ve played around with a few variations.

I think the problem is my Internal Zener references.