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Author Topic: My Headphone Amplifier Buffer  (Read 2027 times)

Offline rdpzycho

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My Headphone Amplifier Buffer
« on: March 05, 2009, 09:16:06 PM »
medyo malabo pala. hehehe. based on CMoy headphone amplifier, dinagdag ko lang 'yung buffer dahil at higher output currents, masyado ng mababa ang voltage swing ng OPA2134. originally, Class B Push Pull lang 'yung output, tapos naka-asa sa global feedback para ma-correct 'yung crossover distortion. ang problema, kapag merong mabilis ang variation na music, minsan hindi nakakasunod 'yung buffer.

ngayon Class AB na, pwedeng baguhin 'yung amount nung current source para kung gusto na mas malaki 'yung region ng Class A operation. lalaki nga lang 'yung idle current.

1/2 of the amp. mas mabilis ako mag-drawing sa notebook kaysa gumamit ng CAD. hehehe.



sa circuit ko ngayon, nagdagdag ako ng 22uF capacitors doon sa tabi ng resistor sa base para mas ma-maintain niya 'yung voltage sa base. present gain ko is 4.

ang problem lang kapag may amp, kahit sa gain na 4, rinig na rinig 'yung noise ng input device. 'yung iPod shuffle maingay ang output. 'yung laptop ko, kapag ginagamit ang hard drive rinig na rinig. 'yung PSP ang maganda ang output, tahimik. tahimik naman 'tong amp kapag walang input. hehehehe.

balak kong magdagdag ng common mode choke sa input nung amp ko. pero hindi ako sigurado kung may effect siya sa audio. theoretically and ideally, wala, pero sa actual hindi ako sigurado.
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My Headphone Amplifier Buffer
« on: March 05, 2009, 09:16:06 PM »

Offline beginner wan

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Re: My Headphone Amplifier Buffer
« Reply #1 on: March 05, 2009, 11:14:18 PM »
Tnx for sharing.. pogi point!  ;D
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R@>&?Ej,@;5H)o::7KE/:?QcXf?gX'39=,Z_Q[eYXc

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Re: My Headphone Amplifier Buffer
« Reply #1 on: March 05, 2009, 11:14:18 PM »

Offline rdpzycho

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Re: My Headphone Amplifier Buffer
« Reply #2 on: March 05, 2009, 11:17:06 PM »
 ;D ;D ;D
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
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"For every difficult problem there is always a simple answer and most of them are wrong."
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Re: My Headphone Amplifier Buffer
« Reply #2 on: March 05, 2009, 11:17:06 PM »

Offline marcelino

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Re: My Headphone Amplifier Buffer
« Reply #3 on: March 05, 2009, 11:47:11 PM »
ginamit mo camera ng phone mo?

next time sir rd, ilayo mo ng konti yung camera... di talga nyan kaya magmacro.

icrop mo nalang kung lumiit.
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Re: My Headphone Amplifier Buffer
« Reply #3 on: March 05, 2009, 11:47:11 PM »

Offline rdpzycho

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Re: My Headphone Amplifier Buffer
« Reply #4 on: March 06, 2009, 12:45:06 AM »
hehehe. tinatamad kasi akong mag-crop. para direct paste lang galing sa phone. ;D ;D ;D
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Philippine Electronics Forum

Re: My Headphone Amplifier Buffer
« Reply #4 on: March 06, 2009, 12:45:06 AM »

Offline j a y k e z

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Re: My Headphone Amplifier Buffer
« Reply #5 on: January 13, 2011, 11:28:48 AM »
up ;D

@ts pa share naman ung schematic at pcb mo sis ^__^
gusto ko gumawa ng Cmoy Head Amp hehehe

Offline makuy

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Re: My Headphone Amplifier Buffer
« Reply #6 on: January 13, 2011, 12:03:49 PM »
Up up

Ako rin ;D

Offline kulapo

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Re: My Headphone Amplifier Buffer
« Reply #7 on: March 05, 2011, 12:22:51 PM »
mga sis may tested diagram po ba kayo ng headphone amplifier? yun pong hindi na ginagamitan ng opamp, puro transistor lang sya tapos kayang bumayo ng mga 300 ohms na head set.

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Re: My Headphone Amplifier Buffer
« Reply #7 on: March 05, 2011, 12:22:51 PM »

 

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