Frequency Multiplier: Build Schematic for 78x Factor

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Discussion Overview

The discussion revolves around the construction of a frequency multiplier with a specific factor of 78. Participants explore various approaches, potential components, and the accuracy requirements for the multiplier, as well as existing chips that may fulfill this function.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant requests schematics for a frequency multiplier with a factor of 78, noting that existing designs typically only cover factors of 2.
  • Another participant references the NE565 chip as a historical example of a frequency multiplier, suggesting a specific configuration involving frequency division by 13, 3, and 2 to achieve the desired multiplication.
  • A participant inquires about the frequency range intended for multiplication, which is clarified to be variable from 1Hz to 20Hz, resulting in an output range of 78Hz to 1560Hz.
  • Some participants mention that the method of multiplication can vary based on the required accuracy, with one stating that a tolerance of ±2Hz is acceptable.
  • There is a follow-up question regarding the suggestions made in an earlier post, indicating a desire for further exploration of the proposed NE565 approach.

Areas of Agreement / Disagreement

Participants express varying levels of interest in the NE565 chip and its application, but there is no consensus on a specific schematic or method for achieving the desired frequency multiplication factor of 78.

Contextual Notes

Participants have not fully explored the implications of accuracy requirements on the design or the specific configurations of the NE565 chip mentioned.

Who May Find This Useful

Individuals interested in electronics design, particularly those focused on frequency multiplication and signal processing applications.

Truthlover
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Hi everyone, I just want to know if anyone here have a schematics to build a frequency multiplier. All I have see for the moment is multiplier with a factor of 2. I'm searching a factor 78 frequency multiplier. Also if it exist in a chip i would like to konw it to.Thanks
 
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The first PLL / frequency multiplier chip (I think) was the NE565 chip in the early-mid 1970's. A block diagram of a NE565-based frequency multiplier is shown in
http://www.circuitstoday.com/wp-content/uploads/2009/09/NE-565-Frequency-Multiplier.jpg
In your case, the frequency divider is by 13 by 3 and last by 2. I put the divide by 2 last so that the NE565 gets a 50% duty cycle square wave. To see inside the NE565, see
http://www.alldatasheet.com/datasheet-pdf/pdf/118262/ETC/NE565N.html

Bob S
 
What is the frequency you are trying to multiply?
 
what said:
What is the frequency you are trying to multiply?

it's variable from 1Hz to 20 Hz to get at the output 78Hz to 1560 Hz
 
There are several ways to do this depending on how accurate you need it to be.
 
I don't need a high accuracy. \pm 2 Hz at the output is good enough for me.
 
he's there someone here
 
Truthlover said:
he's there someone here

What about Bob's suggestions in post #2?
 

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