Hi guys, I want to share my project with you all and to provide as further details as possible about it so if anything is inadvertently left out just let me know.
The project is completely finished and working like a charm. Hope you like it.🙂
Some of its main features are:
-Dual mono setup.
-300WRMS PA boards with LME49830 input section and 3 output pairs of 2SJ201/2SK1530 transistors.
-The boards can be biased all the way from class B to class A.
-uPC1237 speaker protection circuits incorporated.
-2x 650VA toroid transformers.
-Star ground configuration.
-Fully regulated and adjustable power supply based on LM723 regulators and 2SB1647/2SD2560 high gain darlington pass devices.
-196800 uF total capacitance bank.
-Soft start circuit.
-Mains DC blocking circuit.
-6V standby mode SMPS based on cell phone charger board.
-40A solid state main relay.
-Power supply to ground dumping resitors circuit during OFF condition.
-Aero beacon style stdby front panel led operation via NE555 circuit (0.1s on, 3s off cycle)
-Power supply main rails front panel monitor with 2 seconds delay circuit at start up.
I really tried not to leave anything to chance and in this process I know I overdone many things.
This is where I started
The project is completely finished and working like a charm. Hope you like it.🙂
Some of its main features are:
-Dual mono setup.
-300WRMS PA boards with LME49830 input section and 3 output pairs of 2SJ201/2SK1530 transistors.
-The boards can be biased all the way from class B to class A.
-uPC1237 speaker protection circuits incorporated.
-2x 650VA toroid transformers.
-Star ground configuration.
-Fully regulated and adjustable power supply based on LM723 regulators and 2SB1647/2SD2560 high gain darlington pass devices.
-196800 uF total capacitance bank.
-Soft start circuit.
-Mains DC blocking circuit.
-6V standby mode SMPS based on cell phone charger board.
-40A solid state main relay.
-Power supply to ground dumping resitors circuit during OFF condition.
-Aero beacon style stdby front panel led operation via NE555 circuit (0.1s on, 3s off cycle)
-Power supply main rails front panel monitor with 2 seconds delay circuit at start up.
I really tried not to leave anything to chance and in this process I know I overdone many things.
This is where I started
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
This is how the finished project looks 🙂
Lets go inside now.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Lets go inside now.
Transformers instalation.
The aluminum plate above supports the soft start circuit in the center, 2x cell phone 6V SMPS (one board at each side), the NE555 circuit for the stdby led operation, and a 2s front display operation delay circuit.
Both 6V PS work in series during ON condition for a 12V output to operate a relay board switching the main PS rails between the dumping resistors during OFF condition and the front panel segment displays during ON state.
The aluminum plate above supports the soft start circuit in the center, 2x cell phone 6V SMPS (one board at each side), the NE555 circuit for the stdby led operation, and a 2s front display operation delay circuit.
Both 6V PS work in series during ON condition for a 12V output to operate a relay board switching the main PS rails between the dumping resistors during OFF condition and the front panel segment displays during ON state.
Rectifier and filter boards, upgraded with Epcos capacitors.There is a total 54400uF before the regulators per channel (27400uF per rail)
Marking for drilling.
Marking for drilling.
There is a total 44000uF/ch after the 723 regulators (22000uF per rail)
Each toroid transformer deliver 2x 65VAC/5A. The regulators are set to +/-65VDC rail voltage. This setup along the stated capacitance bank per channel provide almost 4.2A pure ripple free DC current per rail.
It's not apparent in the picture but this dummy load resitors had some trouble keeping up with the PS current and they were emiting smoke plume
Each toroid transformer deliver 2x 65VAC/5A. The regulators are set to +/-65VDC rail voltage. This setup along the stated capacitance bank per channel provide almost 4.2A pure ripple free DC current per rail.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
It's not apparent in the picture but this dummy load resitors had some trouble keeping up with the PS current and they were emiting smoke plume
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Regulator boards close up.
An externally hosted image should be here but it was not working when we last tested it.
Relay board. This will switch the main rails between the front panel segment displays and the dumping resistors beside.
An externally hosted image should be here but it was not working when we last tested it.
Open side view.
An externally hosted image should be here but it was not working when we last tested it.
Mains DC blocking circuit. I installed a 50A diode bridge and 18000uf capacitors.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The enclosure original front panel is out of a solid 8mm thick black anodized aluminum plate. This was highly impractical so I decided towards redoing it in smoked acrylic.
It consists of 2 parts. The back plate will hold the push in/push out strt button and the stdby led. It's made out of 8mm thick smoked acrylic.
Looks like cracked in the picture but that's an artifact
It consists of 2 parts. The back plate will hold the push in/push out strt button and the stdby led. It's made out of 8mm thick smoked acrylic.
Looks like cracked in the picture but that's an artifact
The front plate will hold the vu meters and the segment displays showing all 4 rail voltages.
I marked everything and got the plate holes laser cut.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I marked everything and got the plate holes laser cut.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Signal cabling inside using OFC highest quality brided wire
An externally hosted image should be here but it was not working when we last tested it.
OK. Which part of Buenos Aires are you from? I was born in Banfield, GBA, and live in San Jasé, Almirante Brown and I'm at job at Bajo Flores, CABA.
Going to my JBL L7 speakers through OFC Monster speaker wire.
An externally hosted image should be here but it was not working when we last tested it.
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