How about recognizing my gift
, I have published both the exact schematic (post#6) and also the layout (post #8)... I am not asking anyone to pay for the gerbers, as already 3 people have got the gerbers. if one is too lazy to drop a PM or its a "big deal" to them, sorry i cant help...Yes, you have to be careful with adding those ground lift resistors and back to back diodes. They might go kaboom.
Hi X,
Why they might go kaboom? I saw many implementations use similar ground breaker, what is wrong with that, please explain.
Thanks
Hi syklab,
He is just having a little fun
i am sure, nothing will go kaboom..reg
prasi
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This is a layout for the Juma's Headphone Amp posted here http://www.diyaudio.com/forums/pass-labs/271926-f5-headamp.html#post4269989 . Some members seem interested in this
the schematic is attached here again for convenience.
will post gerbers later..
Thanks Prasi.
I believe I'm the instigator
Thanks for this nice and compact layout.
BR,
Eric
Thanks Eric.Thanks Prasi.
I believe I'm the instigator
Thanks for this nice and compact layout.
BR,
Eric
I would say you pointed me to this ckt which made me do the layout.
Reg
Prasi
Yes, always have been using Eagle, sprint is easy but needs lot of manual checking and eagle (bird) eyes.
I must appreciate your energy, always impatient to try new things!
reg
prasi
Hi Eric,
BC550/560 pair would lower the noise, Also the pots (P1,P2) control Iq of the ckt. Sim shows, with lower resistance setting of the pot and hence higher Iq, distortion decreases. Juma recommends 50-100mA.
reg
Prasi
Thanks Prasi.
Since your Juma HA PCB is very small (50mm x 50mm) I was thinking of building a 'small' headphone amp. I already have a 30VA toroidal and some +/- voltage regulators but all this makes the HA enclosure too big for my taste. I'm looking for a different approach.
Do some of you know the TPS5430 from TI ?? There is a small (50mm x 50mm) PCB on e-bay (see link below) that takes a single polarity DC input, lets say 19Vdc and converts it to +/- 15Vdc (by changing 2 resistors). This would reduce the size of the HA enclosure by a large margin. Also, no mains going into the enclosure, the whole HA could be powered by a single 19Vdc laptop power supply, just like the one from the ACA power amp.
The TPS5430 works at a fix 500KHz. I couldn't find if it's noisy but one of the application stated in the spec sheet is Pro audio mixer so looks OK for audio product I guess...?
NEW TPS5430 Positive Negative Dual Power Supply Module with Switching | eBay
Any feedback about my idea is welcome..positive or not ;-)
BR,
Eric
Since your Juma HA PCB is very small (50mm x 50mm) I was thinking of building a 'small' headphone amp. I already have a 30VA toroidal and some +/- voltage regulators but all this makes the HA enclosure too big for my taste. I'm looking for a different approach.
Do some of you know the TPS5430 from TI ?? There is a small (50mm x 50mm) PCB on e-bay (see link below) that takes a single polarity DC input, lets say 19Vdc and converts it to +/- 15Vdc (by changing 2 resistors). This would reduce the size of the HA enclosure by a large margin. Also, no mains going into the enclosure, the whole HA could be powered by a single 19Vdc laptop power supply, just like the one from the ACA power amp.
The TPS5430 works at a fix 500KHz. I couldn't find if it's noisy but one of the application stated in the spec sheet is Pro audio mixer so looks OK for audio product I guess...?
NEW TPS5430 Positive Negative Dual Power Supply Module with Switching | eBay
Any feedback about my idea is welcome..positive or not ;-)
BR,
Eric
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I am somewhat removed from civilization with limitd connectivity. I do not have any idea abt TPS5430, someone who actually has built one could comment.
reg
prasi
I think you have a couple of options. Get two 19v SMPS (small netbook ones) and hook in seriesfor +/-19v power supply. Or get a buck converter and tie two of them from single 19v supply and then put them in series for plus minus supplies. These need to be voltage isolated buck converters otherwise cannot be out in series.
I don't know if these will work - needs to be isolated.
https://m.nl.aliexpress.com/item/32...-1476840504220-08151-rbMv3Fyb6&aff_platform=y
I don't know if these will work - needs to be isolated.
https://m.nl.aliexpress.com/item/32...-1476840504220-08151-rbMv3Fyb6&aff_platform=y
That's a 5v unit. You mean 15v dual rail like this?
DKE10A-15: Mean Well : POWER SUPPLY ENCAPSULATED DC-DC 2 OUTPUT 15 VOLT-15 VOLT 0.333A/-0.333A 10W 5-PIN : Power Supplies & Wall Adapters
60mV ripple will require more filtering with CLC or something. Also 18v max input can that handle 19v brick?
DKE10A-15: Mean Well : POWER SUPPLY ENCAPSULATED DC-DC 2 OUTPUT 15 VOLT-15 VOLT 0.333A/-0.333A 10W 5-PIN : Power Supplies & Wall Adapters
60mV ripple will require more filtering with CLC or something. Also 18v max input can that handle 19v brick?
The eBay board is 5v output. Can it be changed? Maybe, but it's all smd. And it only has 470uf of capacitance. So, without additional caps you will be extremely undersized in PSU.
This appears to be a switching regulator. I was wondering how it's able to regulate 2 amps with no heatsink.
I don't know much about these but it's not something I would try or recommend. It's probably intended for digital circuits (hence the 5v) and by the time you add enough capacitance you will lose all the size advantage.
If you are looking for small, I would probably recommend an ic based ab or class d design.