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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If C3 is too large, turn-on and turn-off of the output stage will be delayed until the voltage on C3 passes the threshold voltage. Output datsheet capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. Andy aka k 10 Natsemi – looks familiar: Such delay may be desirable to avoid spurious outputs due to transient frequencies.
LM datasheet, Pinout ,application circuits Tone Decoder – National Semiconductor
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LM567 Datasheet PDF
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. I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2. Output is low when tone is ‘detected’.
What you and other sources online datashset demonstrated is how to determine the detection frequency using C1 and R1. Sign up using Email and Password.
How exactly does one calculate the proper filter capacitors for the tone detector? Link to datasheet – for the at least? 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.
National Semiconductor – datasheet pdf
TI LM data sheet here – Detailed design requirements are given in section Post as a guest Name. Without this the device is about as good at detecting tones as is a pillar of salt.
Here is an online calculator for all tone related components. Currently I use 2.
LM used in IR controller. The Philips data sheet makes design easy [tm]. Shockingly poor wrt applications. Lots of ideas – each image links to a page. 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. Rl on pin 8 in the diagram below.