TA1000PS - PSU for audio amplifiers with protection, sofstart and fan controller - diyAudio
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Old 20th July 2014, 10:18 AM   #1
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Default TA1000PS - PSU for audio amplifiers with protection, sofstart and fan controller

TA1000PS is a free project that wants to fill the need for electronic kits for complete realization of a high power amplifier.

TA1000PS includes: a DC voltage protection on the output amplifier, speaker delay, fan speed control to cool amplifiers heatsinks and one output +/-12Vdc to power an audio preamplifier.

Since the project is more than 1Mb, I attached a external URL:
TA1000PS - Power supply for audio amplifiers with protection, sofstart and fan controller included

The software will be written in the microcontroller is attached below.

From the construction point of view, as you will notice, the schematic TA1000PS is divided into:
- A power supply circuit for audio amplifiers (includes a bridge rectifier and filtering capacitors = four pieces of 10000uF-100V);
- One output +/-12V DC for the power relay = 24Vdc/20 or 30amps (including the related protections) and for the power external circuit, such as an audio preamplifier;
- A circuit or a separate power supply, electrically isolated, to power two fans (one fuzzy controller with Atmel MCU (Attiny45) but you can also use Attiny85). The software MCU I will post below;
- a filter on the 230 VAC supply.

The software I can customize it, for example, if you want the DC fans to respond differently to various temperature thresholds. This is necessary because, in a certain situation, how fan speed variation with temperature may not be the most suitable. The cost will be a modest if you want only change temperature range (eg, $ 10).

Noted that the above software has been designed on the following fields of temperature:
- 0 ... 40 degrees C - speed 0, fan off
- 40 .. 55 degrees C - about 40% of rated speed
- 55 ... 70 degrees C - about 70% of rated speed
- 70 ... 85 degrees C - nominal speed;
- 85 degrees C - thermal protection on each channel amplification part (the fan runs at full speed). If the temperature drops below 85 gr. Celsius, the controller resumes normal operating cycle.

Depending on the type of fan used can record small variations in measurements mentioned above. The project was designed to operate with 12VDC fans (max. 0.75A) but can be adapted (by change two resistors) and for 24VDC fans. Of course, the input power brigde voltage will be higher if you want to use 24VDC fans.
For temperature measurement, I used two pieces LM35, one on each channel.

This project has been tested and works flawless.

P.S. Unfortunately, PCB's have not done because there was not enough users on my site to subscribe.

I hope you enjoy this free project and if there are any questions, please ask in this thread.
Attached Files
File Type: zip soft TA1000PS v.1.0.0.zip (604 Bytes, 39 views)
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Last edited by donpetru; 21st July 2014 at 05:15 PM. Reason: english correction
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Old 20th July 2014, 11:38 AM   #2
AndrewT is offline AndrewT  Scotland
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Quote:
loudspeakers coupling delay (so-called soft start),
I think you mean speaker delay/isolation.

Soft start refers to the way Mains Power is applied to the transformer during the Power ON moment and shortly thereafter (say 100ms).
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Old 20th July 2014, 12:20 PM   #3
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Quote:
Originally Posted by AndrewT View Post
I think you mean speaker delay/isolation.

Soft start refers to the way Mains Power is applied to the transformer during the Power ON moment and shortly thereafter (say 100ms).
You're right, thanks for correcting my english.
In Romanian notion of softstart has several connotations, but in English, which you outlined above is very correct.
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Old 21st July 2014, 09:15 AM   #4
AndrewT is offline AndrewT  Scotland
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you have not changed post1
It still states " (so-called soft start)" !
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Old 21st July 2014, 05:16 PM   #5
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Now I think that "the text sounds" much better.
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