#1
I've had this homemade L-Pad for a while now, and it's very useful, but it has a habit of exceeding 100 degrees celsius, and has burned a hole in my carpet on more than one occasion.

So, I decided to rehouse it! Also, I'll include steps to make your own if you're interested.

Step by step guide to making your own resistive attenuator
Step One
For this, you need to find your amp's impedance loads, find your amp's maximum output power and approximate what amount of attenuation you want, I went for 12dB. For your amp's output power, put about 1.5 times what it outputs because of RMS and clean volume etc.

This data is then inputted into Weber's L-Pad attenuator calculator to find the values you need: http://www.webervst.com/lpad.htm

Step Two
Now, you purchase a pair of jacks, some wire, solder, and a pair of resistors, preferably rated higher wattage-wise than you are told, but you will most always never get an exact value as stated by the calculator due to standardised values, so there may be some compromise here but you shouldn't drift too far.

Step Three
Now you just assemble it according to the schematic. Plug it in, hey presto, an attenuator. Treble and Bass compensation can be added if desired as it cuts the more extreme frequencies a bit, but overall it's an effective attenuator and great for bedroom practice.

Pics of mine:
The enclosure (hole is kinda for ventilation, I'll add more vents later if needed):


The jacks:


The insides (look at the neatness ^.^):


I'm gonna get some Thermal Paste and stick the resistors down to the enclosure on Monday kinda time.
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Last edited by MrCarrot at Mar 30, 2008,
#2
Looks nice! Would probably have built on if I didn't have an attenuator already.
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#3


It's probably not as good as the Weber MASS, and it's non adjustable, but it's damn cheap.
The Laney Thread are big and clever. No exceptions.
#4
Very neat indeed. How much, roughly, would it cost? And the maximum output power is what it's rated at, right?

Anyways, looks good
#5
I would build one of these but with only 15w of power I don't have to worry about such excessive volume.

But nice build though! Really neat.
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#6
^^ The resistors are worth something like 3 quid each, the enclosure 5 quid, jacks 50p the pair.

What you input for your maximum output power should be 1.5x your amp's rated output power, as most if not all amp companies measure output in peak clean RMS, meaning your VC15 will put out 15w before it starts to distort, and something like 23w at max.

The smaller the resistors, the cheaper the build.

^
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#7
hmm thats looks slightly familiar mr carrot. Wouldnt be mine would it...

Iv got some thermal paste btw
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#8
Quote by blub man
hmm thats looks slightly familiar mr carrot. Wouldnt be mine would it...

Iv got some thermal paste btw
O RLY?

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The Laney Thread are big and clever. No exceptions.
#9
nah not much
MIM Tele
Yamaha Pacifica 112
Marshall ED-1 Compressor
Morley Power Wah
Boutique booster
Digitech Bad Monkey
Electro Harmonix Small Clone
Electro Harmonix #1 echo
THE BEAST (head)
Line 6 Spider II head
D130F
Greenbacks
#10
Can I get the attenuator teh pasted then?

You can have your compressor back, too btw.
The Laney Thread are big and clever. No exceptions.
#11
after lunch yeah
MIM Tele
Yamaha Pacifica 112
Marshall ED-1 Compressor
Morley Power Wah
Boutique booster
Digitech Bad Monkey
Electro Harmonix Small Clone
Electro Harmonix #1 echo
THE BEAST (head)
Line 6 Spider II head
D130F
Greenbacks
#12
it occurs to me im not really sure where the paste is, but thats attention to detail...
MIM Tele
Yamaha Pacifica 112
Marshall ED-1 Compressor
Morley Power Wah
Boutique booster
Digitech Bad Monkey
Electro Harmonix Small Clone
Electro Harmonix #1 echo
THE BEAST (head)
Line 6 Spider II head
D130F
Greenbacks
#13
what values did you end up using? that is pretty cool. how would you keep it from overheating soo bad?
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