Hi All,
I've recently renewed my interest in electronics by attempting to repair an old, broken guitar amplifier I have.
To avoid damaging the speaker, I'd like to build a dummy load for testing purposes. It's a 100W amp, though I have no intention of pushing it at full power while under test until I'm 100% sure it's fixed.
The amp takes a 4-ohm load. I found these on eBay:
**broken link removed**
My thought is to put them in parallel for a 4-ohm 100W dummy load. I also like the idea of having a 50W 8-ohm load for if/when I ever work on an amp that requires an 8-ohm load.
In looking around some of the other electronics forums, I see some people don't like the idea of using wire-wound resistors for dummy loads because they have an inductance. Others say the inductance is negligible.
I have two questions:
1.) Generally, what are your thoughts on using wire-wounds for dummy loads?
2.) I'm wondering why a (somewhat) inductive load wouldn't more accurately mimic an actual speaker? After all, the speaker has a coil. So I'm wondering why some people are against using wire-wounds for dummy loads?
All help/info appreciated. Am I over-thinking it?
Thanks all!
Bud
I've recently renewed my interest in electronics by attempting to repair an old, broken guitar amplifier I have.
To avoid damaging the speaker, I'd like to build a dummy load for testing purposes. It's a 100W amp, though I have no intention of pushing it at full power while under test until I'm 100% sure it's fixed.
The amp takes a 4-ohm load. I found these on eBay:
**broken link removed**
My thought is to put them in parallel for a 4-ohm 100W dummy load. I also like the idea of having a 50W 8-ohm load for if/when I ever work on an amp that requires an 8-ohm load.
In looking around some of the other electronics forums, I see some people don't like the idea of using wire-wound resistors for dummy loads because they have an inductance. Others say the inductance is negligible.
I have two questions:
1.) Generally, what are your thoughts on using wire-wounds for dummy loads?
2.) I'm wondering why a (somewhat) inductive load wouldn't more accurately mimic an actual speaker? After all, the speaker has a coil. So I'm wondering why some people are against using wire-wounds for dummy loads?
All help/info appreciated. Am I over-thinking it?
Thanks all!
Bud