Resistor bank dummy load for testing amplifiers - DIY build
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- Опубліковано 15 бер 2023
- It is time to upgrade my dummy load for testing amplifiers.
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Email: johnaudiotech@gmail.com
Thank You! - Наука та технологія
Very nice load box.
Great project! Thanks John!
Greetings again from Mansfield! When I built my multiple-kw load resistors for testing car audio, I found the best dollar per watt solution to be buying heavy nichrome wire and wrapping some coils out of it and mounting them in front of an old PC fan. I've got 4x 1 ohm sections to work with.
I wonder if you wind it in two directions it would be less inductive
Bake a cake from scratch. First, create the Universe, start gravitational collapse of hydrogen clouds, begin nuclieosynthesis, etc etc. There does seem to be at least three other things you have to do first to approach building the thing you initially want to.
Very nice, great job
ive built many amp dummy loads for 200-400w per channel with cheap alloy clad wirewounds and personally not seen any issue with inductance , my typical use scenario is looking for crossover distortion ,oscillation or other instability and asymetry so my thoughts are that amps in real world to run into an inductance so why do people avoid wire wound loads? i want the amp to show tendancy for misbehaviour
Some cutting oil is paraffin based, candle sounds like a decent option. I built a dummy load but went in parallel. I have several 2, 4 8 and 16 ohm 100 watt resistors I can use individually or gang up to drop the ohms but increase wattage. Works great for testing power supplies and amps.
I use 1500w space heater as dummy load. It’s never gotten warm.
Looks great and so useful.......cheers.
Good to see the video
Nice Audio Load bank 👍
this is one of those things where you have to force yourself to build something propper, because you keep trying to get by with something thrown together in 10 minuites flat, and the heatsink paste has dried out years ago but you keep using it ,yes ive done that , the resistors were cooking and the heatsink was cold! i find it best to fan cool them because you always end up running for longer than intended trying to find some asymetric clipping fault and the temp rises sharply when the heat soak effect runs out of physical mass and the convection cooling isnt antwhere near as effective as sheer mass or fans
A+
Nice
- I hear you, man. I recycle and reuse parts frequently. Why throw away $$$? BTW, I appreciate your videos.
Nice load!
nice,amazing
Radio shack actually never went out of business they down sized and are still on line and are found in other small electrical shops on the east coast mostly. I also thought they were closed down but there still around just not that easy to find besides online but there web site isn't the greatest just a little fyi to any one wondering 🤔😉👌👍✌️🎵🎶🛠️💯
You sure it's them or did someone buy the name. I say this because something similar happened with Dick Smith Electronics here in AUS/NZ. Went from a source of parts to a source of horrible plastic junk with some electronics inside.
@@m3chanist it supposed to be the same the store aren't as big and there website not that great and there only a handful full of them but there still around the hole cell phone radio shack what almost took them out completely it's still there name but the only way to really no is if you can actually find one and go there hope that helps 👌👍✌️💯🎵🎶🍻🛠️
It's very hard to get those resistors here
I'm searching for them locally since 2021
My dummy load are parallel resistors in a treacle tin full of oil - the oil helps dissipate the heat but you need to make sure the lid is firmly on !
You may find the big metal cased resistors easier to get where you are.
Wonder if it's worth adding a few switchable capacitors into the load for stability tests ?
Could I use a carbon pile battery load tester as a resistive load?
Very intresting video, I have build a couple of variable dummy loads with some power transistors in the past, will that not work for audio applications?
diy variable dummy loads are always for dc. hes building for ac -now i always thought you just add a bridge rectifier to run a dc dummy load at ac but then i thought for testing amps you dont want the crossover distortion (2x 0.7v dead zone) and non linearity (diode voltage sag due to heating) thatll cause when you are looking for crossover distortion asymetric clipping and such with a scope across the dummy load
How would one go about producing a reactive dummy load?
You would do just as well mounting the big heat sink on top
Yes nice but you know after doing those testing Dummy load we need to hear it seriously, you have to crank it pump it up, purpose of buying a power amp is hear the punch on the chest .. but great job anyway
Clearly The End Is Near if even poor Americans are complaining about prices of resistors...
First?