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Audio Limiter Circuit - ElectroSchematics.com
https://www.electroschematics.com/audio-limiter-circuit-schematic/
Share this: This audio limiter circuit is easy to build, works with BA741 8pins or 4pins so pay attention and uses a symmetrical power supply. When the audio input level is between 20mV and 20V the output will be a constant 25mV signal. Audio limiters can be used in a transmitter schematic or in any circuit you need a constant audio level.
An AGC - or rather AVC - for rigs without one.
https://k4lxycw.wixsite.com/blog/post/an-agc-or-rather-avc-for-rigs-without-one
LED/LDR audio limiter in uBitx A common problem with many kit rigs, such as the QCX and uBitx, is that they have no AGC. When a strong signal is encountered, it can be hard on the ears. I recently put together a uBitx v6 as a winter project. I’d had a v3 some years ago and it presented quite a few challenges. I was curious if things had improved.
DIY LED/LDR Optocoupler
https://sound-au.com/project200.htm
The LED is quite obvious, and the LDR is inside the section that isn't removed. The LED is intact and shows normal forward voltage drop, but no visible light could be seen when it was powered. This indicates that the LED is actually infra-red, and the low forward voltage of 1.5 V using the diode test facility in my bench multimeter tends to ...
LDR Limiter for TA2020, TA2024, spirited playback without ...
https://www.diyaudio.com/community/threads/ldr-limiter-for-ta2020-ta2024-spirited-playback-without-clipping.210466/
To get the LDR's to work most easily, build atop a 20k volume pot with the LDRs from wiper to ground and from 820R to 1K series resistors at input (or just turn the pot dial slightly off of max if you intend to replace the pot with equivalent resistors later). With the LDR's off then parallel the weakest with a resistor to make the channels match.
Automatic Wah/Quack Effect Using LED+LDR ... - …
https://www.deeptronic.com/electronic-circuit-design/automatic-wahquack-effect-using-ledldr-controlled-band-pass-filter/
The modification of a band-pass filter circuit is done by replacing a fix resistor with an LDR (light dependent resistor), which is exposed to the light of the envelope-controlled-LED. The filter is build around U1D components, and a 1 nF capacitor is added to short the op-amp’s inverting input to the ground, limiting the high frequency response in a trade of high frequency stability of the …
Fast Audio Peak Limiter
https://sound-au.com/project67.htm
Figure 2 - Fast Audio Peak Limiter. As described above, the attack time with the values shown is 5ms, with a release time of around 1 second. This is a good compromise for most audio material, but is readily changed by altering the values of R13 (attack) and R11 (release/ decay).
Light Activated LED using Photoresistor LDR - Circuits DIY
https://circuits-diy.com/light-activated-led-using-photoresistor-ldr/
Light Activated LED using Photoresistor LDR. In this article we are going to demonstrate a simple and interesting project of a light-activated LED circuit, using an LDR and photoresistor. This circuit is very easy to build and beginner-friendly we are using only six components. The photoresistor is used for the purpose of sensing the light.
Building DIY 1176 Compressor
https://www.masonaudio.org/diy/comp1176
Building DIY 1176 Compressor. The UREI 1176 Peak Limiter is a classic audio compressor designed by Bill Putnam, first built in 1967, making use of FETs and using them as a variable resistor to control the gain reduction in the circuit. The 1176 has been employed in countless recordings over the years and it is still used by almost every recording studio...
Langevin ELOP (Electro Optical Limiter) Red | Woodland ...
https://reverb.com/item/49796258-langevin-elop-electro-optical-limiter-red
The principle of operation is based around using a rectified sample of the audio to shine an LED (Light Emitting Diode) onto an LDR (Light Dependent Resistor). The photo-resistor in combination with a fixed resistor simply act as a changing voltage divider to attenuate the signal-- like a smart volume control.
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