You make some cool stuff! I can't believe how long it's been since my last post. Watching my grandson 3 days a week has slowed me down quite a bit.
I have all the foam pieces cut and some assembled into panels. Photos soon, I promise!!!!
i have been working on a20 preamp
started work on MTM with peerless mids and hiquphon tweeter
both still work in progress
i have finished f1j amp, and will make another, this time just f1
since I like the sound of transconductance amps, i was experimenting with various chip amps, since they are cheap and available
here is my first prototype conversion of XY LM3886 chip amp
i will describe step by step procedure if anyone is interested in doing so
the sound is much more musical after the conversion
started work on MTM with peerless mids and hiquphon tweeter
both still work in progress
i have finished f1j amp, and will make another, this time just f1
since I like the sound of transconductance amps, i was experimenting with various chip amps, since they are cheap and available
here is my first prototype conversion of XY LM3886 chip amp
i will describe step by step procedure if anyone is interested in doing so
the sound is much more musical after the conversion
Attachments
pretty much, but slightly different mod
previously it was in Joe Rasmussen's threat using LM3875 chip, and his circuit
this time I made mods into three of my XY LM3886 chips, much simpler mod, no adjustments
I have now finished all three and are using them with 3way active crossover. I should post picture.
previously it was in Joe Rasmussen's threat using LM3875 chip, and his circuit
this time I made mods into three of my XY LM3886 chips, much simpler mod, no adjustments
I have now finished all three and are using them with 3way active crossover. I should post picture.
Here are some pictures, all three amps stacked, as well as all three separate power supplies. Active crossover still needs some better box.
These are the speakers I am currently using it with, Aurum Cantus mid, Beston planar tweeter, and pseudo Pioneer woofer, dynamic drivers are open baffle in the back. The crossover is set to 300/3000 Hz, and I do not like it, I would prefer, say 200/5000, yes, the Aurum can go as high as 5000, I used it with ribbon before.
One thing I noticed, even though there is absolutely no passive crossover between the amps and speakers, it needs tweeter to be in switched polarity. Measurements showed that.
Happy New Year!
These are the speakers I am currently using it with, Aurum Cantus mid, Beston planar tweeter, and pseudo Pioneer woofer, dynamic drivers are open baffle in the back. The crossover is set to 300/3000 Hz, and I do not like it, I would prefer, say 200/5000, yes, the Aurum can go as high as 5000, I used it with ribbon before.
One thing I noticed, even though there is absolutely no passive crossover between the amps and speakers, it needs tweeter to be in switched polarity. Measurements showed that.
Happy New Year!
Attachments
I am not happy with crossover points
while 3kHz between the mid and tweeter may be ok, I want to push it higher, maybe to 5kHz, so it can be used with ribbons
on the other hand, mid can easily handle 200Hz, so I want to modify the crossover point lower
but this is low priority project, I am building F1, Aleph J and Whammy all at the same time
while 3kHz between the mid and tweeter may be ok, I want to push it higher, maybe to 5kHz, so it can be used with ribbons
on the other hand, mid can easily handle 200Hz, so I want to modify the crossover point lower
but this is low priority project, I am building F1, Aleph J and Whammy all at the same time