Will that's a pretty neat project as well. The time you must have put into figuring out the best way to handle the code must have had some trial and error for sure! The way you can put any number of 4 tube boards together and it adapts is really neat.
Bill On Friday, June 25, 2021 at 8:11:23 AM UTC-7 wyager wrote: > If anyone wants to build an IN-13 or IN-9 based analyzer, I have all my > schematics etc available on GitHub for this project: > http://yager.io/vumeter/vu.html > > https://github.com/wyager/vumeter/ > > Software (DSP and tube control) is written in Rust. Schematics in KiCad. > > Will > > On Jun 25, 2021, at 04:10, Paul Parry <[email protected]> wrote: > > Hi Alex, > > > > The electronics were custom designed, and one of the members of this group > kindly did the PCB layout / design. There was an analogue processing board > that had 2 channels ( 10 pictured, so 20 channels ) That contained a > butterworth filter for selecting the desired frequency band, you can see at > the bottom of the board the relevant components are fitted, as they > determine the frequency so during test and setup they get fitted. The rest > of the circuitry linearizes the signal and then some circuitry to drive the > IN-13. > > There is then another board that isolates and amplifies the incoming > audio, and provides the 120v dc for the tubes. > > <IMG_20171115_1216430.jpg> > > Here's a view of the complete set up inside the case: > > <IMG_20180802_150246.jpg> > > They are quite a job to put together, as I only made them in small > quantities, the boards were all SMT assembled by hand which took a good 30 > hrs to build up a set up, and then each channel had to be individually > 'tuned' so you need a calibrated signal generator and a scope, but as it is > all analogue you end up with an instantaneous response and the selectivity > of the channel is very precise. > > Best wishes, > Paul > > > On Thursday, 24 June 2021 at 09:31:44 UTC+1 Alex wrote: > >> Hi Paul, >> >> Can I ask what electronics you used for these? Was it completely custom >> or something bought in? I know I have a case of in13 somewhere (and many >> cases of in9) so should plan something with them and this looks very nice! >> >> Cheers, Alex >> >> >>>> >>>> >>>> >>>> -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/a1334243-476e-4730-acc7-4988a1430eb4n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/a1334243-476e-4730-acc7-4988a1430eb4n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > <IMG_20171115_1216430.jpg> > <IMG_20180802_150246.jpg> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/f502d26c-d717-4243-8440-3f7889bfee46n%40googlegroups.com.
