Those have a single 18VAC winding. The easiest fix is to get a couple small 15VAC transformers to go with them.
Hi Evan,
You can try to run them at slightly lower bias - like 55mA per pair or so. Non-switching circuit does the job, keeping distortion low even at this lowish bias. My prototype was running perfectly at 65ma per pair.
Try X4 - it's a pretty unique thing with very accurate sound reproduction 😉
Cheers,
Valery
I have a pair of the transformers for monoblock builds. I was planning on adding a +- regulator for the 15vdc supply needed. How much current is required?
My bias is quite a bit higher almost 90 mA per pair. I'll adjust it down a bit.
My bias is quite a bit higher almost 90 mA per pair. I'll adjust it down a bit.
A nice package arrived today. As usual the boards look very nice. I'm excited to see the vertical vfa board. I have been liking the Spooky/slewmaster driving the midbrange and woofers. It will be fun to try some of these designs in that position. The vertical cfa ns ops is superb driving the tweeters.
It will take me some time to look these over. I'm sure I'll have some questions.
Thanks
E
It will take me some time to look these over. I'm sure I'll have some questions.
Thanks
E
Attachments
Pretty much everything for a great build - even the PSU with rails control.
Cool choice of the front-ends
Control board - you've got a spare one for this build, right?
Questions - welcome 🙂
Yes very cool.
I'm excited to put another great pair of amps together but as usual it will take me some time to get everything together. It seems like I never have enough time or money....
I was planning on pirating a power supply from one of my built amps but the setup has been sounding so good lately that I will build this one from scratch and see where it fits in. With the "spooky" slewmaster on midbass and the vertical cfa driving the ribbon tweeter I think my system sounds the best it ever has.
Thanks to all,
E
I'm excited to put another great pair of amps together but as usual it will take me some time to get everything together. It seems like I never have enough time or money....
I was planning on pirating a power supply from one of my built amps but the setup has been sounding so good lately that I will build this one from scratch and see where it fits in. With the "spooky" slewmaster on midbass and the vertical cfa driving the ribbon tweeter I think my system sounds the best it ever has.
Thanks to all,
E
Good luck Evan!
Don't worry i don't finalizing nothing as i haven't the money also.
I have a lot of amplifier boards but no power supplies not protective circuits ,no chassis...😡
The boss is a jerk...He'll never go for it.
My time is so limited that if I build something I don't want it to be just an experiment. For me a big part of the fun in putting something together is using it.....be it a piece of stereo equipment or car or stuff for the house.
My time is so limited that if I build something I don't want it to be just an experiment. For me a big part of the fun in putting something together is using it.....be it a piece of stereo equipment or car or stuff for the house.
Evan, take your time - I like your careful style of building (and of course - the custom-made wooden compartments). More care and attention during assembly phase -> less issues on power-on 😀
Cheers,
Valery
Cheers,
Valery
Wow that is a cool looking piece of gear!
Sorry I have been dragging my feet lately. It's Christmas time around here so everything else is kind of on the back burner. I been enjoying seeing what everyone is working on. Thimios is always productive and his testing is awesome!
Blessings, Terry
Hi Evan,
for my new builds I will use external power supplies so I can "plug in" different amps to compare.
Coming up with a protection circuit might be more complicated.
Harry
The new plate amp fired right up and worked great, but was having some troubles with false triggering of the DC detection circuit. Having the DC detection circuit right on the output of the board added a lot of ripple the rail feed to the DC detection circuit and showed me a glitch in the DC detection circuit design. Valery saved the day and came up with a simple fix for the issue and this thing is working perfectly now. Some scope shots will follow.
Great job Jeff!
Since the SS relay is right on the board now, the output connection goes straight to the output terminal.
Perfect - simpler and shorter wiring of the high-current circuitry.
Since the SS relay is right on the board now, the output connection goes straight to the output terminal.
Perfect - simpler and shorter wiring of the high-current circuitry.