Scavenging ultra low noise power supply

jackinnj · 5th September 2008, 04:12 PM

On Marshall Leach's site he makes mention of the LC Audio power supply for an MC Preamp he designed -- http://users.ece.gatech.edu/~mleach/headamp/ -- I guess it's something like this -- all you have is diode noise:

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

MRupp · 7th September 2008, 10:32 AM

Presuming these are standard LEDs in your diagram I don't think you would get any current to speak of. However, you could use solar panels instead. I see small panels at differnt voltages at my local electronis store (Conrad). Just one example:

Measures: 122 x 115 x 3 mm, Nominal Voltage: 18 V, Nominal current: 0,038 A, price 16,36 EUR. They are optimised for daylight spectrum so you might get less current/voltage with a lamp. Sounds like an interesting alternative to big filters on a normal power supply.

jackinnj · 7th September 2008, 01:46 PM

I did get some photo-cells at the town dump and they were new -- problem was that some of them had a battery connection with poor solder joint...easy enough to fix.

This is the same town dump from which I got my bike frame, a Marantz 2235 and a H.H. Scott 400. Some go to deposit, others to withdraw.

MRupp · 7th September 2008, 04:32 PM

Understand now, so you really mean solar panels not diodes - was really wondering what you were up to. I used to scavenge TV sets at the town dump when I was a kid, mostly for resisters, but have not been there ever since

.

The only "free" source of solar panels over here that I can think of are some funny boxes that are mounted along the Autobahn every few kms and are powered by these panels. At least I presume they are free but I may be wrong

But back on the noise, since you appear to have all kinds of measuring equipment you could gve them a try and report back. Would be very interesting.

5th September 2008, 04:12 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Scavenging ultra low noise power supply On Marshall Leach's site he makes mention of the LC Audio power supply for an MC Preamp he designed -- http://users.ece.gatech.edu/~mleach/headamp/ -- I guess it's something like this -- all you have is diode noise: An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

7th September 2008, 10:32 AM	#2
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	Presuming these are standard LEDs in your diagram I don't think you would get any current to speak of. However, you could use solar panels instead. I see small panels at differnt voltages at my local electronis store (Conrad). Just one example: Measures: 122 x 115 x 3 mm, Nominal Voltage: 18 V, Nominal current: 0,038 A, price 16,36 EUR. They are optimised for daylight spectrum so you might get less current/voltage with a lamp. Sounds like an interesting alternative to big filters on a normal power supply. __________________ Martin Rupp

7th September 2008, 04:32 PM	#4
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	Understand now, so you really mean solar panels not diodes - was really wondering what you were up to. I used to scavenge TV sets at the town dump when I was a kid, mostly for resisters, but have not been there ever since . The only "free" source of solar panels over here that I can think of are some funny boxes that are mounted along the Autobahn every few kms and are powered by these panels. At least I presume they are free but I may be wrong But back on the noise, since you appear to have all kinds of measuring equipment you could gve them a try and report back. Would be very interesting. __________________ Martin Rupp

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7th September 2008, 01:46 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	I did get some photo-cells at the town dump and they were new -- problem was that some of them had a battery connection with poor solder joint...easy enough to fix. This is the same town dump from which I got my bike frame, a Marantz 2235 and a H.H. Scott 400. Some go to deposit, others to withdraw.