Actually, the last two amps built were Valery's design. I also etched a Le Monstre last week, I have boards for the AX-14 on a ship somewhere and just ordered a pair of BMG8 boards. So not "all" OS designs. Last week hooked up to the A/B setup were three different versions of the VSSA, a FetZilla, a KSA50, a Symasym, an SKA GB150 and a slew of Slewmaster combos. Believe me, it is not a limiting design.
Blessings, Terry
Blessings, Terry
Terry,
You have so many different amplifiers it becomes hard to keep track. I do have a pair of Lazy Cat's VSSA amps that I have yet to complete and some from Harrison also. I also have a pair of boards from Jason for the Slewmaster output section but not the input section yet. If power output is not an issue to drive a pair of speakers do you have a favorite design? I understand that all of what you have built have been high quality designs but can you say you like any one over the others for sound quality?
You have so many different amplifiers it becomes hard to keep track. I do have a pair of Lazy Cat's VSSA amps that I have yet to complete and some from Harrison also. I also have a pair of boards from Jason for the Slewmaster output section but not the input section yet. If power output is not an issue to drive a pair of speakers do you have a favorite design? I understand that all of what you have built have been high quality designs but can you say you like any one over the others for sound quality?
Does all this subjective stuff have anything to do with a build? If not the main thread would probably be the best place for continuing the discussion. I'd like to keep this thread for builds please.
Okay Jason, I get all the different CFA vs VFA and slewmaster threads and it gets a bit confusing to keep them all in check.
ps. Terry you can PM me an answer to that question if you would. I see your reply above this and I will stop it also.
ps. Terry you can PM me an answer to that question if you would. I see your reply above this and I will stop it also.
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My apologies if I went off a little. It is just my wish to keep this thread closely related to builds of official SlewMaster circuits or viable variants. Too many threads end up way out in left field when folks pile in with unrelated discussion.
Just finished 2OP boards/Symasui-running at 45V, dc offset 1mV both channels-sounding great. I am now sourcing parts for the 5OPS with two of 400VA trafos. Just a question re front panel push button switch- rate 3A 250VAC - would it be ok?. Quan
Will you be using a decent soft-start circuit? That would likely work with a well controlled inrush current, otherwise I'd try to source something more like a 10A two pole switch for longevity.
Glad to hear you build went well quan. Any comments that might help me improve the experience of a slewMaster build?
Hopefully others will share their builds in time as well. I'd love to have some folks post up some pictures too.
Hopefully others will share their builds in time as well. I'd love to have some folks post up some pictures too.
Thanks Jason. I will be using Aussieamp soft start module with the button switch or should i get a higher rating switch as you stated above?. I will try to get some pics tonite after work.
Quan
I think you 3A switch will be fine. I must remember that regional mains differences play a key role in parts ratings. I live in a 120V region and so tend to think of current requirements double that of those that live in a 240V area.
Hi Guys,
This is probably going to sound a little nuts but I was sitting here today looking at all the extra IPS boards I have and started wondering about building a very simple OPS to play around with. Inspired by the VSSA that drives a pair of laterals directly from the VAS I plugged a couple of them into spice behind the Syasui IPS. It runs but I'm sure I have something wrong somewhere so before I burn up some devices I though I would have you guys look at it. I know I probably need a vbe multiplier but hopefully you guys can give some suggestions. I want to keep it as simple as possible. This is just for fun and hopefully to learn something.
Blessings, Terry
This is probably going to sound a little nuts but I was sitting here today looking at all the extra IPS boards I have and started wondering about building a very simple OPS to play around with. Inspired by the VSSA that drives a pair of laterals directly from the VAS I plugged a couple of them into spice behind the Syasui IPS. It runs but I'm sure I have something wrong somewhere so before I burn up some devices I though I would have you guys look at it. I know I probably need a vbe multiplier but hopefully you guys can give some suggestions. I want to keep it as simple as possible. This is just for fun and hopefully to learn something.
Blessings, Terry
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D9 and D10 are oriented to pass current directly from one rail to the other. If the intent was to use them as 'catching' diodes then reverse their polarity and connect the junction to the output node. Gate protection is also integral to the Renesas laterals, though with Alfet or Magnatec parts they would be advised. R31 and VR32 can be replaced with a simple VBE multiplier or even a pair of small diodes. I like the VBEx because it is adjustable.
Thanks Jason. I actually saw the diode mixup and changed it with an edit. Maybe you can look at it again. I don't know what a VBEx is. Do yo have a link? I suppose I could Google it.
What kind of diodes are you talking about and how do you adjust the bias with those in there?
Thanks
What kind of diodes are you talking about and how do you adjust the bias with those in there?
Thanks
Sorry I used VBEx as a colloquial shorthand for VBE Multiplier. I'm surfing on a tablet at the moment so a diagram isn't so easy right this second. Look at my VSSA schematic and you see the single NPN transistor in the middle Q8, along with R15, VR2 and C3 are the VBE Multiplier circuit.