I'm trying to implement this circuit from the datasheet for a supply voltage of 5V and an input frequency of Hz. Given my input signal frequency range, I'm trying to figure out how to set the full scale range of the frequency measurement. Page 3 of the data sheet says the the typical output range of pin 1 is 10uA to uA. This also means you can probably get a dynamic measurement range of Because uA is the maximum current, you'd want to choose a resistor that doesn't cause the output to hit the 5V end-stops so if you reckoned 2.
On the other hand, if you chose the circuit of figure 19 - the current output from pin 1 goes into a virtual earth op-amp circuit and therefore the restriction on impedance is of no importance any more - but obviously you have to obey the rule of not having so much gain in your op-amp circuit that the output hits the rails. I think it's worth mentioning that although when operating as a voltage to frequency converter, a dynamic range of dB is attainable 1Hz to kHz you won't be able to get anything like this when operating as a frequency to voltage converter as mentioned above.
Sign up to join this community. The best answers are voted up and rise to the top. Hey, I checked circuit above and first question which came to my mind is: It is possible to calculate elements and construct a circuit on LM adjustable from low frequencies 50Hz to highest for example kHz?
Could you explain what part should be extended in this case or could you give me some tips for it? Thnaks, Sanczos. Thanks for the F-V circuit that you have sent to me today, indeed I had lounged for it for so long.
Thanks; Ssekatawa. Allthough power factor correction circuits are achievable, the usage of them are pretty much illegal unless under license. Author jacky. Proteus Tutorial — Switches and Relays March 8, Audio oscillator circuit February 22, Geytharanathan 4 years ago.
Hi Can we step down the V to 12V 50Hz using transformerless X-Rated capacitor stepdown circuit for measuring the voltage. Can this circuit be connected with lm for car tachometer. Dear 6 years ago. Forums New posts Search forums. Best Answers. Media New media New comments Search media. Blogs New entries New comments Blog list Search blogs. Groups Search groups. Log in Register. Search only containers. Search titles only.
Search Advanced search…. New posts. Search forums. Log in. Install the app. Contact us. A Voltage to Frequency VTF converter is a circuit, which converts a voltage level to a linearly proportional frequency. A special configuration of the LM IC performs this conversion. Interestingly, this same IC also performs the FTV conversion as shown in the previous pages of this article.
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