Part Number: LM, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor. The LM and LMC are general purpose tone decod- ers designed to provide a saturated transistor switch to ground when an input signal is present within. DESCRIPTION. The NE/SE tone and frequency decoder is a highly stable phase-locked loop with synchronous AM lock detection and.
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National Semiconductor – datasheet pdf
Russell McMahon k 9 LM used in IR controller. Here is an online calculator for all tone related components. If C3 is too large, turn-on and turn-off of the output stage will be delayed until lm5667 voltage on C3 passes the threshold voltage. Lots of ideas – each image links to a page. Currently I use km567. Sign up using Email and Password. TI LM data sheet here – Detailed design requirements are given in section Sign up or log in Sign up using Google.
The tone I’m trying to detect is a tone at 5Khz. Shockingly poor wrt applications. I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2.
Everything is working OK with the exception of the tone detector, yet I can hear the tone when I hook up a speaker to my circuit at the point where the tone detector can pick the same noise up. If C3 is too small, frequencies just outside the detection band will switch the output stage on and off at the beat frequency, or the output may pulse on and off during the turn-on transient.
I’m making a wireless remote control system using the and IC’s. Post as a guest Name. Such delay may be desirable to avoid spurious outputs due to transient frequencies.
Link to datasheet – for the at least? Output is low when tone is ‘detected’. Without this the device is about as good at detecting tones as is a pillar of salt.
What equation do I use for the input and output filter capacitor for the to successfully detect a 5Khz tone? C3 sets the band edge of a low-pass filter which attenuates frequencies outside the detection band to eliminate spurious outputs. Rl on pin 8 in the diagram below. Sign up using Facebook.
Page contains most of what you need to know, but there is also much more there that is useful. Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. It is likely that the lack of output is due to you not having allowed for the fact that the LM has an “open collector” output.