Asking for PLH complete project

Jay · 28th September 2005, 06:21 AM

I have quick read the pdf and googled and read some threads to get the initial idea about this baby, but still have no idea about how I can build this PLH.

The FET, can I use one of K135 (or the J50 I don't remember).
The FET, can I use IRFP250?
The JFET, I will find from old PCBs but what should be the rating?
How big is the heatsink for FET?
How big is the heatsink for R? (I think I'll use light bulb!)
Is it 10W? How about the total consumption?

Please point me to pictures if available

Nelson Pass · 28th September 2005, 08:38 PM

1) You can use any N channel power Mosfet you like

2) Yes

3) There is no Jfet in the design as published

4) Big. You want a sink which will rise about 25 deg C with
an 80-100 watt dissipation per channel

5) Light bulb requires no sink, but consumes about 20 watts
each

Jay · 4th October 2005, 11:29 AM

Thank you Mr. Pass.

I rechecked the pdf and I saw Q1 (JFET) and Q2, so I still don't get it...

May be I need to read more threads

Light bulb consumns about 20W. I took it that resistors consumn much less than that.

Nelson Pass · 4th October 2005, 08:16 PM

I think you are looking at the wrong project. The PLH
is identified by that title, and the one with the power JFET
is Zen Variations #8 (ZV8).

Jay · 6th October 2005, 12:24 PM

Oh, thank you. That's my mistake

I will build a PLH tonight. With a 28V rail

28th September 2005, 06:21 AM	#1
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Asking for PLH complete project I have quick read the pdf and googled and read some threads to get the initial idea about this baby, but still have no idea about how I can build this PLH. The FET, can I use one of K135 (or the J50 I don't remember). The FET, can I use IRFP250? The JFET, I will find from old PCBs but what should be the rating? How big is the heatsink for FET? How big is the heatsink for R? (I think I'll use light bulb!) Is it 10W? How about the total consumption? Please point me to pictures if available

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28th September 2005, 08:38 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	1) You can use any N channel power Mosfet you like 2) Yes 3) There is no Jfet in the design as published 4) Big. You want a sink which will rise about 25 deg C with an 80-100 watt dissipation per channel 5) Light bulb requires no sink, but consumes about 20 watts each

4th October 2005, 11:29 AM	#3
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Thank you Mr. Pass. I rechecked the pdf and I saw Q1 (JFET) and Q2, so I still don't get it... May be I need to read more threads Light bulb consumns about 20W. I took it that resistors consumn much less than that.

4th October 2005, 08:16 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	I think you are looking at the wrong project. The PLH is identified by that title, and the one with the power JFET is Zen Variations #8 (ZV8).

6th October 2005, 12:24 PM	#5
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Oh, thank you. That's my mistake I will build a PLH tonight. With a 28V rail