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RJM Audio - The Sapphire Headphone Amplifier
https://phonoclone.com/diy-sapp.html
The Sapphire headphone amplifier circuit topology. The Voltage Stage. The voltage gain circuit is a textbook non-inverting op amp gain block. In front there is a 20 kohm volume control and an input coupling capacitor C1. An input series resistance R1 linearizes and balances the impedance seen by the op amp inputs. ... RJM Audio 2016 Site built ...
RJM Audio - The Sapphire Headphone Amplifier
https://phonoclone.com/diy-sap4.html
Current Feedback Amplifiers. The Sapphire is a classical current feedback amplifier (CFA) optimized for operation at audio bandwidths. The basic CFA topology has three stages, as shown: Current feedback amplifier circuit topology. (Using the wikipedia schematic as a starting point, the Sapphire is obtained by substituting input transistors for R2, R3, removing Cs, and adding a V …
RJM Audio Sapphire Desktop Headphone Amplifier | diyAudio
https://www.diyaudio.com/community/threads/rjm-audio-sapphire-desktop-headphone-amplifier.196149/
This is the new discussion thread for the Sapphire amplifier. Previous threads, 183588-headphone-amplifier-drop-replacement-phonoclone-3-vsps300 160460-rjm-audio-gainbloc-preamplifier-mk-i are redirected here. Information about the kit …
RJM Audio Sapphire 4 Headphone Amplifier – (mis ...
https://enjon.uk/2020/05/12/rjm-audio-sapphire-4-headphone-amplifier/
RJM Audio Sapphire 4 Headphone Amplifier. I came across this headphone amplifier project about a year ago on DIYaudio.com. Built using the default choices, the class A output buffer provides 30 mW minimum output power into all headphone loads between 30 and 600 ohms. One of the things that impressed me was the continual input the designer ...
RJM Audio Sapphire Headphone Amplifier / Preamp Prototype ...
https://www.head-fi.org/threads/rjm-audio-sapphire-headphone-amplifier-preamp-prototype-boards-available.542577/
The Sapphire amplifier is a fairly standard op amp + diamond buffer. Zener diodes are used for voltage references. The boards have a jumper to switch from class A open loop to class AB closed loop operation, and the circuit values can be optimized use either as a headphone amplifier or a preamp.
RJM Audio Sapphire Desktop Headphone Amplifier | Page 31 ...
https://www.diyaudio.com/community/threads/rjm-audio-sapphire-desktop-headphone-amplifier.196149/page-31
Since you are running the DAC directly (?) into the Sapphire, there is probably no need to have the coupling cap C1. Removing it could, I suppose, reduce some power line noise coupling since the DC impedance of the whole input section is lower. The impedance at 50/60 Hz though would be low even...
RJM Audio Sapphire Desktop Headphone Amplifier | Page 6 ...
https://www.diyaudio.com/community/threads/rjm-audio-sapphire-desktop-headphone-amplifier.196149/page-6
RJM Audio Sapphire Desktop Headphone Amplifier. ... I'm basically skeptical, based on the old audio axiom "there is no such thing as a free lunch". Adjusting the bias on the fly like that has got to have downsides, though -other than the complexity- they are not immediately obvious to me. I'll look into it though...
RJM Audio Sapphire Desktop Headphone Amplifier | Page 86 ...
https://www.diyaudio.com/community/threads/rjm-audio-sapphire-desktop-headphone-amplifier.196149/page-86
This is the new discussion thread for the Sapphire amplifier. Previous threads, 183588-headphone-amplifier-drop-replacement-phonoclone-3-vsps300 160460-rjm-audio-gainbloc-preamplifier-mk-i are redirected here. Information about the kit …
RJM Audio Sapphire Desktop Headphone Amplifier | Page 78 ...
https://www.diyaudio.com/community/threads/rjm-audio-sapphire-desktop-headphone-amplifier.196149/page-78
RJM Audio Sapphire Desktop Headphone Amplifier. Thread starter rjm; Start date 2011-09-08 12:55 am; Prev. 1 ...
RJM Audio Sapphire Headphone Amplifier / Preamp Prototype ...
https://www.head-fi.org/threads/rjm-audio-sapphire-headphone-amplifier-preamp-prototype-boards-available.542577/page-2
RJM Audio Sapphire Headphone Amplifier / Preamp Prototype Boards Available Home. Forums. Misc.-Category Forums. ... Hot Audio DAC-WOW Amps: Project Polaris, Sapphire, Project Sunrise II, O2, various Class-D amps, Musical Paradise MP-301 ...
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