I'd like to build this amp, I already got all parts needed except the choke. Hammond 193V will be too expensive for shipping cost and extra customs fee. I'd like to ask local builder to wound the choke with m6 core.
My question is what the minimum inductance required? What is the formula to calculate it?
Thanks
My question is what the minimum inductance required? What is the formula to calculate it?
Thanks
Depends on how low the amp needs to cover. If it is a full range amp then Michael recommended to aim for at least 100 mH. If it is just for the midrange or tweeters then you could get away with less.
In my similarly choke loaded amps I run 193V for mids and 50 mH 193Ts for the tweeters, working great so far.
In my similarly choke loaded amps I run 193V for mids and 50 mH 193Ts for the tweeters, working great so far.
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Hello guys,
I just want to know if the reactor loaded 2sk82 can be loaded whit danley sh-60f speakers?
Whit different bias? Any thoughts?
Thanks...
I just want to know if the reactor loaded 2sk82 can be loaded whit danley sh-60f speakers?
Whit different bias? Any thoughts?
Thanks...
I know that...🙂 I would use the inductor as a load in parallel whit danley spekers (they are 4ohms),
what I want to know is the 4ohm load good enough for the SIT?
what I want to know is the 4ohm load good enough for the SIT?
This days, I become lazy! 🙂 It will work but I will get a little less power as whit 8 ohm load.....
I am no guru but with 4 ohm speakers u design with less voltage and more current output. But since u will only need like one watt at most for party levels the need is not great. Unless u are a headbanger and u are planning a rock concert😉
Inductor works on any grade, the grading just determines what voltage you need at the gate to conduct X A of current. Some grades (KD) might need say -2V for 2 amps, which you get with a 1 ohm source resistors. My KE I tested needed ~ -4V if I remember correctly so I had to build a negative supply.
If you do build a negative supply that you can control by pot from say 0 to -10V then you should be able to use pretty much any grade. You can mix grades too on each amp as you can just set different bias voltages.
Also, inductors are awesome! I'm using the Hammond 193V on my midrange amps and 193Ts on my tweeter amps.
OllBoll , thank you for the answer. I have all the necessary parts to amp and I will build it .
Another question , when done have it set to 0v and go negative voltage for adjusting , or start -10V and go to reducing 0v ? Just not my toast SITs 😀
best regards
Another question , when done have it set to 0v and go negative voltage for adjusting , or start -10V and go to reducing 0v ? Just not my toast SITs 😀
best regards
If you start at 0V then you will likely toast them 🙂
The SITs conduct more current the with higher voltage at the gate. When stating you want to conduct minimum current so set the voltage supply to minimum voltage. Then you increase voltage at gate until you have the desired current flowing through the device. If you have 193V and use 24V supply around 2A works great.
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All that info is in the vgs curve, which shows current through device if voltage at source is X in relation to drain.
http://www.diyaudio.com/forums/images/articles/Rothacher/s2k82a.jpg
On this device a gate equal to source thus 0V difference would at 20V conduct about 5A which is a bit too much so we need that negative supply.
http://www.diyaudio.com/forums/images/articles/Rothacher/s2k82a.jpg
On this device a gate equal to source thus 0V difference would at 20V conduct about 5A which is a bit too much so we need that negative supply.
OllBoll , Perfect explanation. Now I have everything I need.
I appreciate your help.
Best regards
I appreciate your help.
Best regards
Hello,
I have a question about my transformer.
A transformer AC 18,69V after rectify 17,3V DC, measured at the rectifier idle.
A transformer AC 19,83V after rectify 19,7V DC, measured at the rectifier idle.
Can I use the transformers or voltage for 193V too low.
Greetings Dir
I have a question about my transformer.
A transformer AC 18,69V after rectify 17,3V DC, measured at the rectifier idle.
A transformer AC 19,83V after rectify 19,7V DC, measured at the rectifier idle.
Can I use the transformers or voltage for 193V too low.
Greetings Dir