Power Amplifier - 20Wrms/channel : DR20W by 1diy

[Ikasamoko]

Sis Dandy magkano kaya kit nito....di ko pa na test yung MP3 ko..wala pala akong amp at speaker..

[1diyMARKET]

Sis Dandy magkano kaya kit nito....di ko pa na test yung MP3 ko..wala pala akong amp at speaker..

Doon sa tagalog na pdf sir, mayroon procedure kung paano i-test kahit wala amplifier, gamit lang ang headphone.   Itong amplifier kit -- hindi kasama ang transformer,   550 php  kumpleto na iyan, pati heatsink, wires, terminal, pcb, materials, connectors.

[Ikasamoko]

Ayos...kuha na rin ako nito for my MP3 player..

[1diyMARKET]

Ayos...kuha na rin ako nito for my MP3 player..

Sure, let us know para ma-asses ng maayos,  check na din kung may source ka ng Power supply, kasi hindi kasali sa package.

[Ikasamoko]

Anung recommend na supply ba maganda dito sis??

[n0th1n6]

Ang ginamit ko dito sir ay 17-0-17 na transformer. Medyo malaki yung transformer, sabi ng nagbigay sa akin 12A daw yon, nakasulat din dun. Transformer na lang ang kailangan mo dahil onboard na ang diode at caps.


libre tetano

Since maliit ang capacitor, siguro lakihan mo na lang trafo para di kapusin. So far ok naman ang tunog nito ayun sa tenga ko .

[1diyMARKET]

para ma-achieve mo ang 20Wrms per channel, siguro kailangan mo ng 24Vac.   Puwede ka gumamit ng dalawa na 0-24V para maliit lang transformer mo,  pagdugtongin mo  24-024, dapat iyong transformer ay naka in-phase.    ang economical ay 18-0-18Vac@3ampere,  lalu na kung pang room lang at listening pleasure ang habol pero hindi mo achieve ang 20wrms/channel. 

Nandoon sa manual kung paano gamitin itong amplifier na kasama ang MP3 module

[Ikasamoko]

so 24-0-24 @ 3A pwede na ba??

[Dandy]

Hi all,  I wrote this in the user manual  as I quote

"Well,  with my 20-0-20 Vac Transformer, with 17Wattrms /channel (34 Wattrms Stereo) instead of 20Wattrms / channel due to power supply issue,  in my opinion is acceptable. I still can enjoy the true power of music in my room, I guess I can only used 50% of its total power  <for my listening pleasure - personal assesment>.

Why I not opt to use the 24-0-24 Vac Transformer to keep the full rated Output?  The expected Vdc at 24Vac is about 33.8Vdc, total rail is 67.68 Vdc.  According to LM1876F Absolute Maximum Rating on page 2 of the datasheet, the Vcc+Vee is 64V with or without input.  With 67.68V,  I already exceeded the Absolute Maximum Rating which damage to the LM1876F may occur.   

In actual,  I soak test the system for several hours and I do not get a failure.  With this power supply, operating at maximum power for several hours is expected to exhibit thermal run away.  It did not!  it’s amazing performance!   Heatsink is really hot, so as the 4 ohms load resistor, I cannot touch it.

However, it is not guaranteed that this may happened to all IC at all situations.  The safest is to use 20-0-20 Vac Transformer.  I tried to use also 18-0-18 Vac at 2 Amperes Transformers,  the Power Output I can squeeze both channels driven is  8wattrms/channel or 16wattrms Stereo."

[Ikasamoko]

I'll stay with 18-0-18...

mas madali pa hanapin compared with 20-0-20...

[tony]

if one is to spec power rating as per FTC, then the following needs to be done:

maintain a constant input voltage say 220volts ac power to your amp, an avr or a variac can be used here......

then using a dummy load of say 8 ohms, you can input a 1khz signal carefully monitoring the output with an ac voltmeter and a scope taking note of the ac output before clipping.....if you have a thd meter you can also use it....

power rating stated on device datasheets are more often than not happening in the real world, that is why i have always emphasized the importance of the psu, after all it is half of the amp....

Hi all,  I wrote this in the user manual  as I quote

"Well,  with my 20-0-20 Vac Transformer, with 17Wattrms /channel (34 Wattrms Stereo) instead of 20Wattrms / channel due to power supply issue,  in my opinion is acceptable. I still can enjoy the true power of music in my room, I guess I can only used 50% of its total power  <for my listening pleasure - personal assesment>.

Why I not opt to use the 24-0-24 Vac Transformer to keep the full rated Output?  The expected Vdc at 24Vac is about 33.8Vdc, total rail is 67.68 Vdc.  According to LM1876F Absolute Maximum Rating on page 2 of the datasheet, the Vcc+Vee is 64V with or without input.  With 67.68V,  I already exceeded the Absolute Maximum Rating which damage to the LM1876F may occur.   

In actual,  I soak test the system for several hours and I do not get a failure.  With this power supply, operating at maximum power for several hours is expected to exhibit thermal run away.  It did not!  it’s amazing performance!   Heatsink is really hot, so as the 4 ohms load resistor, I cannot touch it.

However, it is not guaranteed that this may happened to all IC at all situations.  The safest is to use 20-0-20 Vac Transformer.  I tried to use also 18-0-18 Vac at 2 Amperes Transformers,  the Power Output I can squeeze both channels driven is  8wattrms/channel or 16wattrms Stereo."

[Dandy]

Ayos...kuha na rin ako nito for my MP3 player..

sabi nila... your package is on transit, you should received it tomorrow.

And of course, puwede mo i-continue and personal Audio systems mo with the (1) preset-Equalizer (soon to offer),  (2) with LCD display,  (3) with remote control  and/or Home automaiton {kung kaya ha!},   the thread is here  http://www.electronicslab.ph/forum/index.php?topic=27749.80

[Ikasamoko]

Dahan-dahan....baka mabulunan..

hehehe....waiting na po..

sis Dandy paki check kasi yung email sakin is 3 pcs na MP3...2 lang yung kinuha mo...

[maldihtah13]

And of course, puwede mo i-continue and personal Audio systems mo with the (1) preset-Equalizer (soon to offer),  (2) with LCD display,  (3) with remote control  and/or Home automaiton {kung kaya ha!},   the thread is here  http://www.electronicslab.ph/forum/index.php?topic=27749.80

Sir ito na lang 20W kukunin ko kung wala pa rin yung 100W. Sana lang kasama na equalizer at speaker protection. Ako na mag-aaral ng controller at at akin na ang LCD at remote.

[n0th1n6]

Try mo na din 100W http://www.electronicslab.ph/forum/index.php?topic=30065.0

[pEN DoTA]

sir dandy good day! nakuha ko yung sa akin from air 21. hindi ko pa natapos assembolin busy pa kasi. post ko dito pag natapos ko na. pls. pm the details on how to pay. thank you.

[pEN DoTA]

ito yung sa akin:






hindi pa rin tapos. 

[1diyMARKET]

nice one,  your special package na DR150W  with TDA8950th na iyong ibang piyesa eh, galing pa singapore, nandito pa rin heheheheheh

[pEN DoTA]

nice one,  your special package na DR150W  with TDA8950th na iyong ibang piyesa eh, galing pa singapore, nandito pa rin heheheheheh

completo na ba yun sir?pag completo na pwede mo ipadala sa akin.

[1diyMARKET]

completo na ba yun sir?pag completo na pwede mo ipadala sa akin.

Kumpleto na  po,  complete na complete,  daldalhin ko doon sa workshop sa Jan 21, iyan ang pinaka burn in test natin, kung buhay pa, iyan ang the best sir.