What current does the relay need when supplied with 12V?
What hFE does the transistor switch work at, when it is saturated?
What is the base current required to saturate the switcher?
It is all very simple.
What hFE does the transistor switch work at, when it is saturated?
What is the base current required to saturate the switcher?
It is all very simple.
I'm attach my amp, X250MkIV with cascoded IPS & VAS by JFET.
The lasted schematic like this pic, but Vas's current mirror is compensation transistor type (sorry, i'm using a computer which can't get the picture).
The sound is very good, more than my Goldmund clone, very clear...
I can't use LTSpice to simulation this schema. I want know THD, SR. Any one can help me and suggest me for this amp to better?
The lasted schematic like this pic, but Vas's current mirror is compensation transistor type (sorry, i'm using a computer which can't get the picture).
The sound is very good, more than my Goldmund clone, very clear...
I can't use LTSpice to simulation this schema. I want know THD, SR. Any one can help me and suggest me for this amp to better?
Attachments
LTSpice is strangely in my country, mainly are OrCAD & Multisim. I've used multisim and feel it is not good. I don't know, i'm trying to learn use LTSpice.
//However, the amp in real life is very good, one of my best in current.
SR100 & SR200 can use tantalum caps in input & feedback. This's can get better sound. I used Vishay 150D 10uF & 100uF/20V paralled with 1uF MKT caps.
Apex sir at what voltage that relay will turn off in that speaker protection from Post #28 1000W Simple PA Amplifier. , and what is pro LED.
Hi Shravanth, please post it in the right thread.
If you post here it is off topic & can make us confuse.
Pro led used to indicate that our amp is in trouble, blink when something not good happen.
My SR200 not use relay & no thump 🙂 when switch on or off
so we don't need any relay here.
Ok, thanks Sir Apex
I will try to find 2SK117, if not available I will try 2SK170 (I have few left) 🙂
Regards
Last edited:
Only SR800 can use fet input pair instead bjt, it use npn input pair biased with 3mA, SR50,100,200 use pnp input pair biased with 1mA.
Regards
I think Apex does not share that schematic.
Apex, can we use Walkalone fet arrangement for LTP then?
Edit: sorry, I'm talking rubbish. To use that arrangement all transistors after the LTP would have to change too, from NPN to PNP and viceversa.
The right way would be to use the 2SK170 complementary: two 2SJ74 or a dual 2SJ109 (if available). Would they work biasing for 3mA?
Apex, can we use Walkalone fet arrangement for LTP then?
Edit: sorry, I'm talking rubbish. To use that arrangement all transistors after the LTP would have to change too, from NPN to PNP and viceversa.
The right way would be to use the 2SK170 complementary: two 2SJ74 or a dual 2SJ109 (if available). Would they work biasing for 3mA?
Last edited:
Hi Apex. I have not found LF411. I can replace it with TL071 or TL081?
Sorry for my english is bad.
Sorry for my english is bad.
Look for a FET input opamp that has low temperature variation offset and low absolute offset.
I will share schematics of my new amplifiers HD50, HD150 and HD300 with J fets in LTP...
Ok, thanks...
So use the p-ch j-fet, but the fet is not available here 😀 & also they must be matched too 😱
Yes, you can use TL071.
I use TL071 at my first SR200 🙂 next one I use LF411(get it online from my friend)
Yes... this is what we waiting,
but with layout or no?
Regards
Last edited: