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pa300 elektor amp
pa300 elektor amp
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Old 7th February 2003, 12:57 PM   #21
OliverD is offline OliverD  Germany
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When amps are bridged, each amp "sees" half of the speaker impedance at its output. Therefore each amp will deliver its 4 Ohm output power when an 8 Ohm load is connected to the bridge.

If an amp delivers 300W into 4 Ohms, a bridge of two such amps will deliver 600W into 8 Ohms.

When your amplifiers are not rated for 2 Ohm loads (this is the case for both PA-300 and PA-600), you should not connect a 4 Ohm load to a bridged version.

This is of course simplified. Often you will see that the output power of a bridged version is not exactly twice the output power of each channel (at twice the load impedance), because the common power supply for both channels is too weak to supply two channels running at max.
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Old 9th April 2011, 07:44 AM   #22
Masoudgh is offline Masoudgh  Iran
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Hi.
I have built PA300 and this is a fine amplifire.
but there is problem in my amp and I didn't know how can I do for this situation and I want to help me.
I test it with function generator with 20Hz to 20khz frequency.
But after 5khz(for instance 10khz) and high power the relay is cut off.but in this stage there is not any clipping and the output voltage is still low than 1khz frequency.in this frequency the output voltage is 27V.
but at 1khz and maximum power there is no any problem.so in this stage the output voltage is around 36V and it is more than the 10khz voltage output.
So in other High frequency for instance 20khz the output voltage would reduct to 20V and in this frequency at that voltage relay will cut off.
please help me about it.
thanks.
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Old 11th April 2019, 09:40 PM   #23
ADMicroNov is offline ADMicroNov  France
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Default PA300/600

Hello
We modified the PA.300 project. The study is in progress.
Attached are some photographs.
Have a good day.
Jacky
Attached Images
File Type: jpg Pa.300_Impl.jpg (439.1 KB, 448 views)
File Type: jpg Pa.300_Pcb.jpg (331.3 KB, 447 views)
File Type: jpg Pa.600_Impl.jpg (381.3 KB, 431 views)
File Type: jpg Pa.600_Pcb.jpg (276.2 KB, 427 views)
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Old 12th April 2019, 06:26 AM   #24
Bruce@bluff is offline Bruce@bluff  South Africa
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I have built both the PA300 AND PA600 both worked well. I did encounter oscillation when using the NE5534 so remember to put a 33pf cap between pin 6 and 2 of the opamp
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Old 12th April 2019, 01:37 PM   #25
ADMicroNov is offline ADMicroNov  France
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Default PA300/600

Hello, Bruce.
Thanks. Noted. For the capacity.
For PA.600, we were not sure of the pattern, according to Olivier.
We have rerouted PA.300 according routing logic note and added the extension PA.600. So we must review the resistors R41 e 42 for the rail 80 volts.
Thanks again.
Jacky
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Old 15th April 2019, 07:33 AM   #26
Bruce@bluff is offline Bruce@bluff  South Africa
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PA 600 essentially the PA300 with more output devices. I ran mine at-+90v and used MJL21193/4 T03
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Old 16th April 2019, 04:16 AM   #27
ADMicroNov is offline ADMicroNov  France
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Hello, Bruce.
Thanks for your advice.
In fact, the printed circuit has been redrawn to miniaturize as much as possible. This is the copy according to PA.300 Elektor. Later, we came across the pattern of Mr. Olivier.
In Pa.600 We just increased the numbers of transistors. and changed the resistances to hold +/- 90 volts. We will start building. We'll keep you posted. Thank you so much.
Best regard.
Jacky.Tanski

Ps:
We also built the Titan, which works perfectly.
Make too, the broom, which works great!
Found transistors by recycling old electronic equipment.
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Old 16th April 2019, 06:05 AM   #28
Bruce@bluff is offline Bruce@bluff  South Africa
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Good luck, unfortunately I sold my pa600. Compared to this modern class d rubbish it sounded fantastic, you will enjoy the sound from both the 300 and 600
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Old 20th April 2019, 02:23 PM   #29
ADMicroNov is offline ADMicroNov  France
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Hello, Bruce.
Sorry, I did not see the message back.
We are checking our work. Diagram, circuit board. We are also in an amp study starting from the work of Quasi and Astx. Attached images.
We give you all the results, when everything will be built.
Sincerely, Bruce.
Jacky
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Old 20th April 2019, 03:03 PM   #30
ADMicroNov is offline ADMicroNov  France
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Default PA300/600

That's what we are trying to build. for now, this is just the study. We left Astx and Quasi.
A big thank you to them. You are a great source of inspiration for us. We are not specialists. but we do our best
There is a lot of enthusiasm for the handymen in Emmaus village. We recover parts by recycling discarded electronic devices.

Note:
This allows us to hold out against the misery that surrounds us and repression against yellow vests.
Attached Images
File Type: jpg AcTr40.Esmbl.jpg (602.4 KB, 195 views)
File Type: jpg Actrk_1.jpg (293.3 KB, 102 views)
File Type: jpg Actrk_2.jpg (261.3 KB, 83 views)
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