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RJM Audio

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Astonishing that someone would go to the trouble of doing this. Just amazing. The debate over whether this is "vinyl sound" can wait for another day.   #LP   #phono   #vinylrecords  
So you've bought a turntable with hopes of hearing that warm vinyl sound, but you don't have a record collection just yet. What to do? If you're Jesse
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Sapphire3 final. Very very happy with how this turned out, but I needed to bracket the transistors to a close range of hfe values to get there. #sapphireamp   #headphoneamplifier   #diamondbuffer  
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LRoy Shreding's profile photoVictor Panics's profile photo
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very nive mount and assembly.
And very expensive spare parts, I see...
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The transplant operation Sapphire2->Sapphire3 took place this morning. The patient is doing very well indeed. Offets -5 mV and 16 mV, no hum or audible noise, channel balance and frequency response good. Bias current stable.

#sapphire3   #headphoneamplifier   #headphones  
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RJM Audio

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I want one, just on principle.
Ever since we released our Three Fives discrete 555 timer kit last year, people have been asking us “When are you going to come out with a 741 op-amp?” It has taken us quite a while to get here, but the answer is… Today! Our XL741 Discrete Operational Amplifier is a real, working op-amp that you ...
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Cool and funny ,good old dip.
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Finally, this nice write up by Pavel Ruzicka who has built his own Gilmore headphone amp. Mmm... classy!
Class A headphone amplifier by Kevin Gilmore. opened amplifier. Menu. Introduction; Circuit description; Original schematics diagram; Dynalo schematics diagram; Power supply schematics; Assembling; Original amplifier component view; Dynalo amplifier component view; Power supply component view ...
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I printed pcb of his dynalo, still matching bjt
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Some DIY resources for the Gilmore headphone amplifier.
The purpose of this web page is to provide a convenient collection of web resources for people who are interested in learning about and building headphone amplifiers based on the various Kevin Gilmore schematics that are in circulation on various internet forums. For a newcomer, it can be very ...
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RJM Audio

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I inherited a stash of iron, that realistically I'm not going to use...
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RJM Audio

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About $50 US shipped. The English instruction manual is only so-so, but the Chinese manual is better, with diagrams - so with a bit of cross-checking its not too hard to figure out.
Part. Measure rich DC parameters of maniford semiconductors, e.g. diode, transistor, controlled silicon, FET. Description Quantity: 1Pc. Measure capacitor, varistor, DC voltage signal source.
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RJM Audio

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Sapphire 3.0f assembled boards, ready for the smoke test!

(yes, they passed ... though one of the 150 ohm PRP resistors was actually 100 ohms (labelled as 150), can you believe it? After replacing that duff resistor, both boards are now working perfectly.)
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William Au's profile photoTony Kwok's profile photoRJM Audio's profile photo
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+Tony Kwok Boards have now passed QC, so sure, please get in touch with me.
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RJM Audio

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Gilmore-Sapphire3 hybrid/composite/mashup headphone amp, ticking over nicely in LTSpice.
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Tony Kwok's profile photoVictor Panics's profile photoRJM Audio's profile photo
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+Victor Panics That, perhaps, but mostly to simplify the BOM by just using BC337/327 throughout. I'm not sure if the output transistors contribute significantly to the output noise or not.
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Or you can just go out and order a Gilmore headphone amplifier for yourself.

#headphoneamp  
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RJM Audio

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Do you wan't gain with that? A Sapphire-Gilmore hybrid headphone amp.

just a rough sketch for now
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Have them in circles
165 people
Alex Chen's profile photo
JustDIYIt's profile photo
niko berserk's profile photo
László Szalmási's profile photo
setyo kawan's profile photo
Luke Chikkala's profile photo
Sunshine Cleaning And Restoration's profile photo
Victor Lin's profile photo
Sam Tsang's profile photo
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A resource for the design and construction of high-fidelity audio equipment.
Introduction
RJM Audio is my hi-fi hobby site. I design and build audio equipment, from interconnect cables to headphone amplifiers to voltage regulators though I'm best known for my VSPS and Phonoclone phono preamplifier circuits.
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