![]() |
A47 / Crystal CMoy
Looking to put together a combination of the two.
Couple of questions...
(all credit due to image creators/owners) |
what headphones? - headphone impedance, sensitivity numbers determines amp I, V requirements
what happened to the O2 build? |
Ah yes forgot to put that in...
Sennheiser 558's... so 50 ohm... O2 build will happen eventually, but probably only next year sometime, so looking to put together something smaller in the mean time |
knowing the 112 dB SPL re 1 Vrms senstivity number helps too
these would actually be fine for most listening direct from most DAP which are designed for even lower Z loads already 3.5 Vpk, 70 mA pk would drive them to ~120 dB SPL single 9V would be fine but you do need to do something re supply splitting or (gasp) output C DC blocking |
Output DC blocking?
Thought that was what the input cap was for, to block DC |
output coupling Caps let the amp signal ground run from a simple resistive supply splitter
but require large caps to get the low frequncy corner below audio with the low Z load of the headphones if you follow the recommendations for "best" practice for the application - seriesed non-polar electrolytic, fc ~1/10 the hedphone 3dB point - they end up bigger than the battery for your 50 Ohm headphones - a detraction for portable use |
Hmm..
I must say, im rather lost, im not going to lie |
please explain more
.
JCX, Are you saying every CMOY type design is flawed because they don't have output caps? |
With the circuit as shown, it needs to be powered by a dual (+/-) power supply. If you don't know what that is you should read the headwize tutorials.
|
question 3 not answered
Paulb,
Per the OP's original inquiry, question # 3 is asking: For the power supply, I'd prefer to steer clear of a voltage divider, so TLE2426, op amp based, or Sijosae's method? (buffers are rather expensive where I am so would like to avoid them) So he's pretty much read all about this. Instead of giving him a drive by condescension, why not give him you insight to the methods you have tried??? |
All times are GMT. The time now is 04:20 AM. |
Search Engine Optimisation provided by
DragonByte SEO (Pro) -
vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 18.75%
vBulletin Optimisation provided by
vB Optimise (Pro) -
vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio