• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Alpha Nirvana 39W SE Class A Amplifier GB

Jump to Latest
#155
Since the Alpha Nirvana use the same topology as the Aksa Lender preamp it doesn’t make sense to use that as a preamplifier.

Are you looking for something with volume control or just a preamp core and you add your own volume control?

Jhofland’s Diamond Buffer is a great preamp. I am in process of ordering more RTR modules.

There is a headphone amp version of this with volume control that makes a superb preamp.

xrk971

Thread 'Pocket Diamond Buffer (PDB) Headphone Amp'

I’m working with Jhofland to develop a new Class AB version of the Pocket Class A (PCA) headphone amp in an Altoids tin called the Pocket Diamond Buffer (PDB). It will use the Diamond buffer discussed in another thread combined with an OPA1642 for the voltage gain. The buffer will be inside the feedback loop of the opamp for a composite amp. This will be a state of the art headphone amp in a nostalgic DIY package. The power on/off will be controlled by the click on the volume pot (same as PCA) but a MOSFET had to be added to turn on and off the negative rail. Power will be two 9v...
  • Like

There is also a Desktop variant.

xrk971

Thread 'Desktop Diamond Buffer (DDB) Headphone Amp'

This amazing little amp has been discussed as part of the DB thread but I think it deserves its own thread given how it has quite different objectives from the Pocket Diamond Buffer (PDB) HPA.

This desktop variant uses TO-126 output BJTs with dedicated heatsinks and does not have the separate MOSFET rail switching needed for the pocket one. The setpoints have been optimized for a moderate 40mA nominal bias current that will let you run in full Class A operation for most headphone uses. It will leave Class A around 250mW into 32 ohms. Of course, you can adjust the emitter resistors to...
 
  • Like
Reactions: Yurid
You must log in or register to reply here.
Top Bottom