hello, has someone come across a buffer with no NFB ? thanks.
V vizion Member Joined 2007 2007-12-11 12:12 am #1 2007-12-11 12:12 am #1 hello, has someone come across a buffer with no NFB ? thanks. ••• More options Share C Chucko Member Joined 2002 chucko.com/ 2007-12-11 12:13 am #2 2007-12-11 12:13 am #2 Does an emitter/source/cathode follower meet your "no NFB" criteria? ••• More options Share V vizion Member Joined 2007 2007-12-11 12:16 am #3 2007-12-11 12:16 am #3 it's something to hop on. do you have the details ? isn't there usually global feedback with that combo ? ••• More options Share Leolabs Member Joined 2004 2007-12-11 2:05 am #4 2007-12-11 2:05 am #4 JFET follower loaded with JFET current source. ••• More options Share V vizion Member Joined 2007 2007-12-11 2:35 am #5 2007-12-11 2:35 am #5 Leolabs, do you have schematics or a link ? ••• More options Share mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home Amplifiers Solid State non-NFB buffer Top Bottom
C Chucko Member Joined 2002 chucko.com/ 2007-12-11 12:13 am #2 2007-12-11 12:13 am #2 Does an emitter/source/cathode follower meet your "no NFB" criteria? ••• More options Share V vizion Member Joined 2007 2007-12-11 12:16 am #3 2007-12-11 12:16 am #3 it's something to hop on. do you have the details ? isn't there usually global feedback with that combo ? ••• More options Share Leolabs Member Joined 2004 2007-12-11 2:05 am #4 2007-12-11 2:05 am #4 JFET follower loaded with JFET current source. ••• More options Share V vizion Member Joined 2007 2007-12-11 2:35 am #5 2007-12-11 2:35 am #5 Leolabs, do you have schematics or a link ? ••• More options Share mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home Amplifiers Solid State non-NFB buffer
V vizion Member Joined 2007 2007-12-11 12:16 am #3 2007-12-11 12:16 am #3 it's something to hop on. do you have the details ? isn't there usually global feedback with that combo ? ••• More options Share Leolabs Member Joined 2004 2007-12-11 2:05 am #4 2007-12-11 2:05 am #4 JFET follower loaded with JFET current source. ••• More options Share V vizion Member Joined 2007 2007-12-11 2:35 am #5 2007-12-11 2:35 am #5 Leolabs, do you have schematics or a link ? ••• More options Share mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Home Amplifiers Solid State non-NFB buffer
it's something to hop on. do you have the details ? isn't there usually global feedback with that combo ?
Leolabs Member Joined 2004 2007-12-11 2:05 am #4 2007-12-11 2:05 am #4 JFET follower loaded with JFET current source. ••• More options Share V vizion Member Joined 2007 2007-12-11 2:35 am #5 2007-12-11 2:35 am #5 Leolabs, do you have schematics or a link ? ••• More options Share mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
V vizion Member Joined 2007 2007-12-11 2:35 am #5 2007-12-11 2:35 am #5 Leolabs, do you have schematics or a link ? ••• More options Share mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
mlloyd1 Member Joined 2001 2007-12-11 2:55 am #6 2007-12-11 2:55 am #6 search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand... ••• More options Share CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
search for the Hafler 915 preamp manual at the Hafler web site. also, numerous links on this site via search function. mlloyd1 vizion said: Leolabs, do you have schematics or a link ? Click to expand...
CBS240 Member Joined 2005 2007-12-11 2:56 am #7 2007-12-11 2:56 am #7 Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought. Attachments a.jpg 39.6 KB · Views: 440 ••• More options Share C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought.
C Charles Hansen R.I.P. Joined 2003 2007-12-11 3:25 am #8 2007-12-11 3:25 am #8 vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own. ••• More options Share V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
vizion said: has someone come across a buffer with no NFB ? Click to expand... If you're looking for a ready made (chip) solution, here are a few: National LMH6321 Burr-Brown BUF634 Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors) Maxim MAX4200 through MAX4205 Or you can roll your own.
V vizion Member Joined 2007 2007-12-11 3:29 am #9 2007-12-11 3:29 am #9 Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore ••• More options Share
Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore
