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Audio Frequency Doubler
https://fletch.scot/radio/frequency-doubler.html#:~:text=The%20doubler%20simply%20consists%20of%20a%20active%20LPF%2Fpre-amp,are%20combined%20and%20so%20the%20frequency%20is%20doubled.
Audio Frequency Doubler
https://fletch.scot/radio/frequency-doubler.html
The doubler simply consists of a active LPF/pre-amp feeding into the actual doubler. The pre-amplified signal is sent unchanged through a diode, and is also sent through an inverting amp and another diode. The two resulting positive half-waves are combined and so the frequency is doubled. Here is the circuit diagram: circuit diagram
Sub Audio Frequency Doubler | Electronics Forums
https://www.electronicspoint.com/forums/threads/sub-audio-frequency-doubler.36531/
"audible" is to use the signal to frequency-modulate a tone near the mid-range of human hearing. This is not the original "sound" by any stretch. Simply doubling a 20Hz signal to 40Hz will be complex and of very limited utility as you are still at the extreme of audible hearing. I know people will tell me I'm wrong, but these are the same people who
How to build a frequency doubler | Cakewalk Forums
http://forum.cakewalk.com/How-to-build-a-frequency-doubler-m1590813.aspx
Given the choice between frequency doubler vs. sub octave divider, I'd prefer the doubler, since I wouldn't mind the low fundamental slipping through a little (who knows, it might warm up the sound). It's good to know a doubler is relatively more accurate.
Frequency Multipliers - Doublers, Triplers, Quadruplers ...
https://www.minicircuits.com/WebStore/Multipliers.html?ez_sample=Y
Sub Audio Frequency Doubler | Page 2 | Electronics Forums
https://www.electronicspoint.com/forums/threads/sub-audio-frequency-doubler.36531/page-2
"Audio Frequency Shifter" by Phil Allison. Covers the band from 20 Hz to 20 KHz with a 4.5 Hz up-shift. ... BJT VHF frequency doubler circuits. Polk Audio PSW250 Sub Woofer. Voltage Doubler. Low frequency FET response, determining f[sub]L[/sub] of Cs capacitor. RE : VOLTAGE DOUBLER.
Frequency Multipliers - QSL.net
https://www.qsl.net/va3iul/Frequency_Multipliers/Frequency_Multipliers.pdf
• The minimum Carrier-to-Noise degradation, ΔCNR, in decibels, caused by an ideal frequency multiplier is: ΔCNR [dB] = 20*LOG (N) where N is the multiplication factor. • Thus, a frequency doubler (N=2) degrades CNR at the input signal by at least 6dB and a quadrupler (N=4) degrades CNR by at least 12dB.
Simple Frequency Doubler Schematic Circuit Diagram 2
https://circuit-diagramz.com/simple-frequency-doubler/
Using just a few discrete components and two inverters, it is possible to build a simple TTL square wave frequency doubler for signals up to about 100 kHz. The input signal is applied to the differentiating circuit R1-C1. This converts the rising edge of the square wave into a positive pulse and the falling edge into a negative pulse.
Frequency Multipliers | Analog Devices
https://www.analog.com/en/products/rf-microwave/frequency-dividers-multipliers-detectors/frequency-multipliers.html
Analog Devices active and passive frequency multipliers enable designers to economically multiply lower frequencies to higher frequencies without creating measurable additive phase noise. This broad portfolio features a range of devices that can meet the size, volume, and cost needs for multiple applications, including: • Fiber optics • LMDS, VS
Adjustable audio frequency converter | All About Circuits
https://forum.allaboutcircuits.com/threads/adjustable-audio-frequency-converter.47173/
I've looked through MC1496 datasheets and sample schematics and have found an audio frequency doubler, but not quite what I need. Background: Most metal detectors have single audio output beeps that aren't adjustable in frequency. This makes it hard for people to use them when they have loss in hearing in a specific frequency range.
Frequency Multiplication Techniques - Crystek
https://www.crystek.com/documents/appnotes/Frequency_Multiplication_Techniques.pdf
term frequency stability in oscillators. It is the square-root of the Allan Variance. The Allen deviation is used because the normal variance will not converge for large sample sizes of frequency data of oscillators. The Allen deviation is denoted by s y (t). Frequency Multiplication by a Noiseless Multiplier Multiplying a signal like Eq. 1.2 ...
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