Carlos Lima
Well-known member
Interested. 2 to 4.
Carlos Lima
Carlos Lima
New design API 525... UPDATE.. METAL IN..PCBs IN
- Thread starter peter purpose
- Start date
Help Support GroupDIY Audio Forum:
Neil
Well-known member
I'm interested in 2 myself.
My wallet not so much.
My wallet not so much.
haima
Well-known member
peter, if you are gauging interest - i'm down for two
gar381
Well-known member
Nice peter
A couple of PCBs for me !!
I'll do me own metel work Mr.p as BLUE is the colour !! ;D ;D
GARY
A couple of PCBs for me !!
I'll do me own metel work Mr.p as BLUE is the colour !! ;D ;D
GARY
dmp
Well-known member
About adding a FET to the meter circuit, I had this in mind. I didn't try it on a breadboard (which would have to be done) but it looks good when I plotted out the voltages.
Similar to a 1176, a second FET mirrors the one in the audio path. Both FETs would share the same cv, so you wouldn't need the meter path on the original schematic anymore (cr3, cr4, r53, r55, c12, r54,r68,cr6).
Since the resistance of the FET is loglinear with cv, the meter voltage from this divider has to go to a log scaled (dB) LED driver. Since you want to see GR steps, something like the LM3915 since it gives even dB increments.
I couldn't figure out how to change the fullscale range on the LM3915 this morning, however. 30dB fs is more than needed. Maybe it could be adjusted or a different chip would give the range you want...
Similar to a 1176, a second FET mirrors the one in the audio path. Both FETs would share the same cv, so you wouldn't need the meter path on the original schematic anymore (cr3, cr4, r53, r55, c12, r54,r68,cr6).
Since the resistance of the FET is loglinear with cv, the meter voltage from this divider has to go to a log scaled (dB) LED driver. Since you want to see GR steps, something like the LM3915 since it gives even dB increments.
I couldn't figure out how to change the fullscale range on the LM3915 this morning, however. 30dB fs is more than needed. Maybe it could be adjusted or a different chip would give the range you want...
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Neil
Well-known member
dmp said:
Couldn't you just leave off the LEDs you didn't want, ie, only use the first 5 for a 15 db scale?
dmp
Well-known member
You could leave off some leds, but you wouldn't have as much detail in the meter.
It would be nice to have 10 steps either 1dB/led or 2dB/led.
It would be nice to have 10 steps either 1dB/led or 2dB/led.
peter purpose
Well-known member
What do we reckon?
fallout
Well-known member
I reckon to count me in.. Looks great!
-jay
-jay
+2
haima
Well-known member
looking good peter!
is the bypass going to be "hard wire"? i find it very useful to have a true bypass on comps and eqs - that way you can leave a few of them in your recording chain and just drop different ones in and out without the colour of going through all the different boxes in "partial bypass". useful for situations where you don't have a patchbay.
regardless i'm very interested in a few channels.
is the bypass going to be "hard wire"? i find it very useful to have a true bypass on comps and eqs - that way you can leave a few of them in your recording chain and just drop different ones in and out without the colour of going through all the different boxes in "partial bypass". useful for situations where you don't have a patchbay.
regardless i'm very interested in a few channels.
peter purpose
Well-known member
Bypass is full on.. in to out... unlike the real thing.
haima
Well-known member
fantastic
Ryake
Active member
Looking good!
fallout
Well-known member
What timeframe are we looking at? I need to start putting some $$ aside..
peter purpose
Well-known member
fallout said:
I'm yet to build the second prototype, so need to proof the mods and try out a further mod on the meter cicuit.
I'll keep you posted.
MM1100
Well-known member
One kit for me.
Thank you sir may I have another!
Thank you sir may I have another!
Winetree
Well-known member
I'd be in for 2 Kits depending on price.
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