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Old 17th November 2011, 03:10 PM   #111
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Default tracking diodes

Hi Joel,

Just to point out the output devices your using have tracking diodes, will you take advantage of them ?

kind regards
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Old 17th November 2011, 04:58 PM   #112
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Quote:
Originally Posted by OnAudio View Post
Use ceramic for high frequency feedback.
Use mica instead
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Old 18th November 2011, 03:00 AM   #113
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Location: Bangalore, India
Nico, you drove your point home, jokingly!!
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Sam
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Old 18th November 2011, 06:08 AM   #114
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Default Type 3

Another representation
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File Type: png fourier.png (28.2 KB, 737 views)
File Type: png frequency.png (28.8 KB, 678 views)
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Old 18th November 2011, 10:23 AM   #115
AndrewT is offline AndrewT  Scotland
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Adjust C8
C8<= C6 * R19 / [R20+R21] / sqrt(2)
Anywhere in the range of 4u7F to 47uF will maintain good low bass response.
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Old 18th November 2011, 06:15 PM   #116
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Quote:
Originally Posted by AndrewT View Post
Adjust C8
C8<= C6 * R19 / [R20+R21] / sqrt(2)
Anywhere in the range of 4u7F to 47uF will maintain good low bass response.
Hi AndrewT,

Here we go.

kind regards,
Attached Images
File Type: png symefT3.2.png (74.8 KB, 655 views)
File Type: png fourier2.png (27.4 KB, 536 views)
File Type: png frequency2.png (28.9 KB, 73 views)
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Old 19th November 2011, 04:29 AM   #117
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Default check again

Quote:
Originally Posted by OnAudio View Post
Hi Joel,

Just to point out the output devices your using have tracking diodes, will you take advantage of them ?

kind regards
the transistor you used not available and change it to 2stc5200 and 2sta1943 is this two ok?sorry for using the wrong output transistor.I already change c8,c6,r8 and zobel network.plus I include a diode in parallel with c6.is this correct?

regards,
joel

p.s. if no correction will be made I will try to buy pcb this week and will use toner transfer method.my printer is laser and produce solid black good for transferring.
Attached Images
File Type: jpg schematic.jpg (246.8 KB, 318 views)
File Type: jpg symef top view.jpg (281.6 KB, 348 views)
Attached Files
File Type: pdf foil pattern symef.pdf (44.7 KB, 112 views)
File Type: pdf schematic.pdf (23.4 KB, 114 views)
File Type: pdf symef top view.pdf (83.5 KB, 97 views)
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Old 19th November 2011, 04:39 AM   #118
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Default bc556

Quote:
Originally Posted by OnAudio View Post
Hi AndrewT,

Here we go.

kind regards,
pin configuration of bc 556 is cbe while mpsa92 is ebc.im planning to use 2n5401 and compatible to the board i have design.is this fine also?
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Old 19th November 2011, 10:23 AM   #119
AndrewT is offline AndrewT  Scotland
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Drow,
replace back to back C8 with a single plastic film 4u7F.
You lose one octave of sub audio low bass frequency response in exchange for the higher quality film over electrolytic caps.
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Old 19th November 2011, 10:43 AM   #120
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Default 4.7uf

Quote:
Originally Posted by AndrewT View Post
Drow,
replace back to back C8 with a single plastic film 4u7F.
You lose one octave of sub audio low bass frequency response in exchange for the higher quality film over electrolytic caps.
I have check the supplier the smallest casing is 26mm x 13mm it takes up the space of the whole input filter circuit.capacitor is metallised polypropylene is there any other way for this?

p.s. can i use metallised polyester or uncoated MKTpolyester capacitor and rating is 63volts?
regards,
joel

Last edited by drowranger; 19th November 2011 at 11:12 AM.
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