SSLV1.1 builds & fairytales - Page 172

wushuliu · 25th August 2012, 08:09 PM

I am doing my first SSLV. Need 5v, 150mA load. I have 1k trimmer. Do I need 1 or 2 Leds? R303 jumper or 220R?

merlin el mago · 25th August 2012, 08:13 PM

Have you read the guide?

Is for digital or analog?

merlin el mago · 25th August 2012, 08:16 PM

5V Vout Mosfet reg. 2 1.9V LED, 220 Ohm R303. Other parts jumper.

There is in 1st post a calculator to calculate the current, always is better x 2 or x 3, in your case 300 or 450mA

wushuliu · 10:20 PM

I am using bjt. No 220r correct? 2 led rest jumpered. I am getting 2v across 20Ohm dummy no change using trimmer.

Salas · 26th August 2012, 12:36 AM

You need the 220R or a simple diode in series with the LEDs. You need to jumper the non used positions to close the series Vref circuit. Use a 33R dummy to simulate 150mA load. Set CCS for 200mA minimum. Your now dummy asks for 250mA you are possibly chocking your CCS setting. Find your CCS current by measuring voltage drop across your setting resistor and dividing by its value.

wushuliu · 26th August 2012, 02:28 AM

Ah, thank you. I was indeed choking the current.Ok so I have BJT, 1k trimmer, 220R and 2Leds. I am getting 300mA w/ 4R 12w and 5.21v out. with trimmer turned all the way. How do I reduce to 5v proper?

wushuliu · 26th August 2012, 03:15 AM

Never mind. Figured it out. Thanks again Salas.

Salas · 26th August 2012, 03:27 AM

What is it built for?

wushuliu · 26th August 2012, 03:44 AM

Odac...

qusp · 26th August 2012, 12:08 PM

haha an interesting mix, the designer must think you very foolish when surely USB power is good enough… hehe

25th August 2012, 10:18 PM	#1714
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	I am using bjt. No 220r correct? 2 led rest jumpered. I am getting 2v across 20Ohm dummy no change using trimmer. Last edited by wushuliu; 25th August 2012 at 10:20 PM.

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25th August 2012, 08:09 PM	#1711
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	I am doing my first SSLV. Need 5v, 150mA load. I have 1k trimmer. Do I need 1 or 2 Leds? R303 jumper or 220R?

25th August 2012, 08:13 PM	#1712
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Have you read the guide? Is for digital or analog?

25th August 2012, 08:16 PM	#1713
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	5V Vout Mosfet reg. 2 1.9V LED, 220 Ohm R303. Other parts jumper. There is in 1st post a calculator to calculate the current, always is better x 2 or x 3, in your case 300 or 450mA

26th August 2012, 12:36 AM	#1715
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You need the 220R or a simple diode in series with the LEDs. You need to jumper the non used positions to close the series Vref circuit. Use a 33R dummy to simulate 150mA load. Set CCS for 200mA minimum. Your now dummy asks for 250mA you are possibly chocking your CCS setting. Find your CCS current by measuring voltage drop across your setting resistor and dividing by its value.

26th August 2012, 02:28 AM	#1716
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	Ah, thank you. I was indeed choking the current.Ok so I have BJT, 1k trimmer, 220R and 2Leds. I am getting 300mA w/ 4R 12w and 5.21v out. with trimmer turned all the way. How do I reduce to 5v proper?

26th August 2012, 03:15 AM	#1717
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	Never mind. Figured it out. Thanks again Salas.

26th August 2012, 03:27 AM	#1718
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	What is it built for?

26th August 2012, 03:44 AM	#1719
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	Odac...

26th August 2012, 12:08 PM	#1720
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	haha an interesting mix, the designer must think you very foolish when surely USB power is good enough… hehe