Attachments
I bought this board from audiophonics. The high gain is a but ridiculous, however I would say it's a good amp for high impedance headphones. I plan on doing a few mods to it. It comes with 20k stepped pot which I will switch out for a 10k ALPS, like the schematic. I'll also bring the gain down to something sensible.
When I have the volume high it seems to clip too. Probably because it runs out of current.
Thinking of making a case at lasergist and also using a 24V wall wart to power it. That way it simple and cheap.
When I have the volume high it seems to clip too. Probably because it runs out of current.
Thinking of making a case at lasergist and also using a 24V wall wart to power it. That way it simple and cheap.
HD600 needs 0.230V to reach 90 dB http://www.innerfidelity.com/images/SennheiserHD600.pdf so x2 should be enough. But it's your ears 
Hi, I am new member here..
I built the Canamp clone you talked about, but I kept a middle ground between the original schematic and the hungarian clone. This way I think it's a good compromise for the ultimate sonority...anyway the amplifier is good for low sensitivity headphones in particular
I built the Canamp clone you talked about, but I kept a middle ground between the original schematic and the hungarian clone. This way I think it's a good compromise for the ultimate sonority...anyway the amplifier is good for low sensitivity headphones in particular
Assuming there is no bad ground wiring, I'd bump C7/C12 to 1000u (or more, if they fit the PCB).
This bring cutoff of the RC filter down to ~5Hz instead of ~60Hz.
Many thanks for your suggestion, my friend. I replaced the capacitors with 2200 uf. There was no improvement. There are no problems with grounding. A low frequency noise persists. Not too loud, but noticeable when there is no music. I will try to change the font filtering as LM317 instead of 7824.
Add a cap multiplier using IRF610. It will have 4v dropout but ripple will be -50dB.
Juma's Easy-Peasy Capacitance Multiplier
Seven years after its launch finally this headphone amplifier became acceptable with the proposed changes. It started with poor design and errors in choosing components. An example of precipitation in product launching and consumer disrespect, minimized by the disclosure of mods to former buyers.
Glad to know about the mods. I'll try out some of the changes.
Running changes happen in any product. You don't get everything right the first time or parts aren't available anymore.
Running changes happen in any product. You don't get everything right the first time or parts aren't available anymore.
Every product can be improved and modified. This happens. But, is not the case this headphone amplifier. It was released with gross and inadmissible errors. Much low frequency noise, lack of heatsinks for power transistors, bad design, among others. Haste is the enemy of perfection.
Add a cap multiplier using IRF610. It will have 4v dropout but ripple will be -50dB.
Juma's Easy-Peasy Capacitance Multiplier
Hi friend. I decided to experiment. This works well! This circuit eliminated the ripple in the listening volume. I will use it on other power supplies.Thank you.