More like a high(er) current VAS (in amp speak).
Edit - you could also go the driver stage way - EF.
One would have to determine what load the regulators gave the best performance.
If you went the voltage way , load would be constant. If you used them as followers
the load would vary.
OS
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hint
Ostripper,
That is correct it requires a lot of work, and I’m not into that at the moment. It was just a suggestion to look into that part but you’re correct. If memory serves me someone here put a lot of effort into this type of amp here his name slips me at the moment. But if I find it I will post it.
john
that is correct, requiers a lot of componets
Ostripper,
That is correct it requires a lot of work, and I’m not into that at the moment. It was just a suggestion to look into that part but you’re correct. If memory serves me someone here put a lot of effort into this type of amp here his name slips me at the moment. But if I find it I will post it.
john
that is correct, requiers a lot of componets
HINT
Hint
I know this is old hat when it comes to regulators as Audio Amplifiers but these are just experiments for me at this time. However I have been attempting this design that Stewart and I did to see what LT Spice does with it. I will say that this it works on the bench but not in LT spice and I think I know why. The parameters are not correct for the device including the LT1083, if using this device for voltage regulators it is right on spec. The simulator just can’t do it to my satisfaction and it would be a waste of my time to try and remodel the part with the correct devices. The simple model found at, index works every time but not in spice. It would be easy to take this example and add some to it and get a good sounding amp for fewer than 20 watts at 8 Ohms, at 4 ohms and below it is going to start and limited itself. I have not tried to parallel the devices yet as some balance between regulators is needed. I also have been able to bridge it and it works fine as I have about 250 of the K devices in obsolete inventory. The only requirement is the extreme heat sink required with the amplifier. If I get around to it I might model the regulator in spice discreet wise and see what happens with the correct transistors if it works I will post the model so it may be expanded on. Hope this help some trying to build this Amplifier.
However a friend of mine has been working on this amplifier in the posted diagram. It’s a transconductance current mode amplifier using bridge mode.The amplifier presented is capable of delivering a good solid 25 W into 8 Ω loads in class A. The operation is bridged which on current drive remarkably improves the efficiency of Class A relative to one-sided feed or voltage drive. Only a single +30 V supply voltage is needed here.Though the sonic differences between current and voltage driving the speakers are orders of magnitude greater than possible differences between the operation classes, this amplifier should be quite ideal for some audiophiles who have reservations about class B or overall negative feedback. All though the regulators each are feedbacked devices, the load applied to them remains always resistive. As I said I’m not posting to pick things apart here it is just given as information you may disagree with the topology on this one but you can’t condemn anything until you build it. My friend likes the way it sounds and says it has been trouble free. I have listened to it at his home on some time windows vintage speakers it is a powerful sounding amp but that is just my opinion, sort of dark sounding but musical. I’m curious if you build it to see what you say about the sound. Hope this adds a little more help with LM317's
John
Hint
I know this is old hat when it comes to regulators as Audio Amplifiers but these are just experiments for me at this time. However I have been attempting this design that Stewart and I did to see what LT Spice does with it. I will say that this it works on the bench but not in LT spice and I think I know why. The parameters are not correct for the device including the LT1083, if using this device for voltage regulators it is right on spec. The simulator just can’t do it to my satisfaction and it would be a waste of my time to try and remodel the part with the correct devices. The simple model found at, index works every time but not in spice. It would be easy to take this example and add some to it and get a good sounding amp for fewer than 20 watts at 8 Ohms, at 4 ohms and below it is going to start and limited itself. I have not tried to parallel the devices yet as some balance between regulators is needed. I also have been able to bridge it and it works fine as I have about 250 of the K devices in obsolete inventory. The only requirement is the extreme heat sink required with the amplifier. If I get around to it I might model the regulator in spice discreet wise and see what happens with the correct transistors if it works I will post the model so it may be expanded on. Hope this help some trying to build this Amplifier.
However a friend of mine has been working on this amplifier in the posted diagram. It’s a transconductance current mode amplifier using bridge mode.The amplifier presented is capable of delivering a good solid 25 W into 8 Ω loads in class A. The operation is bridged which on current drive remarkably improves the efficiency of Class A relative to one-sided feed or voltage drive. Only a single +30 V supply voltage is needed here.Though the sonic differences between current and voltage driving the speakers are orders of magnitude greater than possible differences between the operation classes, this amplifier should be quite ideal for some audiophiles who have reservations about class B or overall negative feedback. All though the regulators each are feedbacked devices, the load applied to them remains always resistive. As I said I’m not posting to pick things apart here it is just given as information you may disagree with the topology on this one but you can’t condemn anything until you build it. My friend likes the way it sounds and says it has been trouble free. I have listened to it at his home on some time windows vintage speakers it is a powerful sounding amp but that is just my opinion, sort of dark sounding but musical. I’m curious if you build it to see what you say about the sound. Hope this adds a little more help with LM317's
John
John, if one don`t share your opinion , that does not means disrespect... I just don`t see what is the benefit of use of regulators, does it sounds better, because I don`t see the amp is simpler then conventional...? You can charge batteries all day long with a classic amp with paralleled bjts or mosfets, so that is also nothing special.
What is better in your amp then some "conventional" amp?
What is better in your amp then some "conventional" amp?
Batteries have nothing to do with this amp. It is just information for you if you need it. No problem just a good single ended Class A bridged. Everybody has an opinion but the question was asked about my amp and what was it. So I added a little information since it’s kind of like that. No problem with opinions. As I said its old hat when it comes to regulators. I must go talk at you later.
John
John
@ johnbedini
Hi, it's a great pleasure to see you here, & here you talk 🙂 I've know about your non audio work & experiments etc for some years, & watched a number of documentaries on TV over that time with you in, & about you, one recently. VERY interesting to me, & many others.
Regards
Hi, it's a great pleasure to see you here, & here you talk 🙂 I've know about your non audio work & experiments etc for some years, & watched a number of documentaries on TV over that time with you in, & about you, one recently. VERY interesting to me, & many others.
Regards
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