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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
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.
Sub Audio Frequency Doubler | Electronics Forums
https://www.electronicspoint.com/forums/threads/sub-audio-frequency-doubler.36531/
Audio frequency doubling, I use a double diode "full wave" method off of an OP amp output for "higher frequencies > 400 hz". It works great ... 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 Doublers - Mini-Circuits
https://www.minicircuits.com/app/DOUB9-2.pdf
Mini-Circuits' frequency doublers are economically priced while covering the very broad frequency range from 5 KHz to 3000 MHz. They offer a very low conversion loss, from 11 dB, and high spurious rejection 40 dB. These doublers give exceptional unit-to-unit matched performance. frequency doubler measurements
Frequency Doubler circuit | Forum for Electronics
https://www.edaboard.com/threads/frequency-doubler-circuit.91315/
digital frequency multiplier circuit I think for Freq. doubler with 50:50 duty cycle ( or 60:40 at least), the best way is pll. for example, u want the output 40MHz, u should make 80MHz VCO output and then divide /2 it for duty cycle. But, u should make just logic and for duty cycle, it is IMPOSSIBLE because of P.V.T variation. If u cant use pll..
Simple Circuit Doubles Input Frequency | Maxim Integrated
https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3327.html
This circuit doubles the input frequency. The reference frequency in this circuit drives the input of an exclusive-OR gate (XOR gate U2) as well as the input to a delay circuit. Consisting of R1, C1, and comparator U1, the delay circuit drives the XOR gate's second input.
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 Multiplier Circuit - Making Easy Circuits
https://makingcircuits.com/blog/frequency-multiplier-circuit/
The circuit shown here is intended as a frequency multiplier for just this purpose which uses a resolution of 0.1 Hz with a fast measuring time. A block diagram of the frequency multiplier is displayed in figure 1. As can be found, this configuration holds more than a passing similarity to the (by now) relatively common PLL frequency synthesiser.
Frequency Multiplier Circuit - Engineering Projects
https://bestengineeringprojects.com/frequency-multiplier-circuit/
Engineeering Projects. Here is a Frequency Multiplier circuit using PLL565. Phase lock loop (PLL) has many diverse applications, among its applications PLL exhibits tremendous flexibility in frequency multiplication. The IC 565 (IC 1) can be used over the frequency range of 0.001 Hz to 500 kHz, and an operating voltage range of 6V to 12V.
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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