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Old 1st July 2007, 09:14 AM   #2021
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Default Charlie_fd.... sorry, i have forgot.


Big condensers.... 2200uf and up, soldered into the board, very near the transistor colectors...from the rails to ground also will help.

But this will be perceived only near the distortion threshold...the clipping threshold.

220N in parallel with the drivers emitter resistance (180 ohms), will behave as suck out of charges during clipping.... will produce less annoying distortions only... really...well.... you know....no one is listening distortions...but perfectionists may need that.

regards,

Carlos
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Old 1st July 2007, 11:05 AM   #2022
sandyK is offline sandyK  Australia
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Default Destroyer X amplifier ...DX amp...my amplifier

Just a reminder to anyone who listens to their DX, or any other amplifier , at such high levels that clipping becomes audible,that you are at real risk of destroying your tweeters. !
Most wives will complain long before you get to this point anyway.
They are far far more sensitive to this than us mere males.
SandyK
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Old 1st July 2007, 11:11 AM   #2023
microp is offline microp  Latvia
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Default Hi, Carlos!

Great daughter! I have daughter too... she is 4 years old

I have started with PSU. I am wiring a transformer now... 25-0-25... -1,4(bridge) * 1,41(capacitors) = ~35V

Today I bought already all parts for Dx one channel. 15euros spent... a lot for me, but low for that kind of amp

For PSU I will use Your schematics... except capacitors... I have 4x22000mF/42V and 2x33000mF/40V (my fathers present )
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Old 1st July 2007, 11:17 AM   #2024
microp is offline microp  Latvia
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Default A lot of components are soviet russia...

but as they told me they are from army pcb's and very low +-%
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Old 1st July 2007, 12:07 PM   #2025
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Default As you are wiring your trafo...try to have 29 plus 29 AC


this way you will have a little bit more power... also your electrolitic condensers will tolerate.

Beautiful girl you have...pretty eyes, good face she has.

Those condensers...specified as 40 volts..they do not explode when you make them work with 41 or 42 volts....there's a safe margin that you can use to your own benefits.

regards,

Carlos
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Old 1st July 2007, 12:27 PM   #2026
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Default Using a little bit more voltage you will be able to have good peak power


this makes dynamic power a little bit more interesting too.

The output, single pair, cannot hold full power for too much long time..say, continuous tone and full undistorted power for too much long time.

But as music is not continuous, you can use this peak power.

As you will be winding your transformer, you can produce the option of 25, and 29 volts tapes.

This power can be produced, over 4 ohms...... and 75 Watts RMS when driving 8 ohms loads.

This will not make the amplifier play loud... that difference is almost nothing to our ears... but.... you will have lower distortions, as it will be able to reach 75 watts during peaks without clip...this turns sound better to our ears.

regards,

Carlos

.................................................. .................................................. ...........

Yes Sandy

When we go to clipping, the waveform turns into square...those waveforms have a lot of harmonics.... exactly those harmonics will kill the tweeter.

thank you, good to remember that.

regards,

Carlos
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Old 1st July 2007, 01:43 PM   #2027
Nordic is offline Nordic  South Africa
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my 26VAC taps produce about 35.5VDC at idle...useing the DX PSU...
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Old 1st July 2007, 04:10 PM   #2028
ecat is offline ecat  United Kingdom
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That's the boards drilled, a test heatsink prepared too

Quick question.

I know earthing was covered earlier in the thread but the replies became a little confusing so:

PSU earth to board at GND

Zobel Earth to somewhere on the board. GND or ELink or doesn't really matter which ?

Speaker ground, from the PCB, but is there a preferred place to connect to ?
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Old 1st July 2007, 04:46 PM   #2029
microp is offline microp  Latvia
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Default Same problem with ground pins...

Don't know where to get all those ground's. Elinks.. AG.. GND.. PE..

I will put them all together to one big ground!?
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Old 1st July 2007, 04:47 PM   #2030
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Default Short length and heavy gauge wire...not too much.... 1.5 milimeter diameter


will bring the transformer center tape connected to ground with screw, solder or do something that guarantee good contact.

This can be done near the board, or under the board, into the metal plate you have under the board....the lower cover of your enclosure.

Also the central point can be near the transformer...also in the back panel..well..small distance and central point.... the point were all ground wire goes.

then run short length wires from the board grounding points to this central point.

This is the method i use...everybody going to the same point..short length, heavy gauge wire.

But there are people better than me in those things.... let's keep thread opened to them to correct my method, to include repairing details or to suggest other better option.

You have an input lifted ground in your circuit board...the 10 ohms resistance is connected to this central ground in one of it's extremes and the other one will constitute into your lift ground....there you will solder the 220 picofarads RF capacitor, the 39K resistance, C10 and C11.... do not worry, as this was made into the circuit board...just observe that one of the grounding points are one of the 10 ohms extreme...the free side, the one not connected to the parts i am refering..

You have two E links to connect using a wire jumper...they will join the rail filter condensers to the ground (central, general standard ground) and you will need to run a wire from the zobel to ground.. the free extreme of C17 will have a wire connected to ground.

regards,

Carlos

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