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pfretrock

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Posts posted by pfretrock

    NSD - Behringer Model 15 (and Model D)

    in Other Instruments

    Posted

    On 10/04/2025 at 08:44, BigRedX said:

     

    So, as long as you can compensate for temperature instability, Oct/Volt is a more sensible method to use?

    I presume so.  Moog's keyboard had a string of 1% 10 ohm resistors., giving a chromatic scale. I've no idea how Hz/Octave works.

    NSD - Behringer Model 15 (and Model D)

    in Other Instruments

    Posted

    I'd never heard of Hz/Volt, but had not been exposed to Korg or Yamaha stuff, being only with "home brew" stuff in my teens.

    One useful property of silicon transistor physics is the exponentional relationship between base voltage and collector current. When calibrated, every volt increment  gives a doubling of collector current and hence an octave shift in oscillator pitch. So easy to implement but very temperature dependant which needed a solution. One of which was to build a heater inside the chip which held the temperature at some higher value probably 70 - 80C. The second generation MiniMoog oscillator circuit used 78.4C

    • Thanks 1

    NSD - Behringer Model 15 (and Model D)

    in Other Instruments

    Posted

    My guess is the weak signal appearing on the jack is to trigger the internal envelopes and an external signal of normal spec can over ride it. Othewise a int/ext switch would be needed. Could use a switched socket - but a less reliable component.

     

    Before I went down the Behringer route, I thought of building a full size copy of a Model D panel, with rotary encoder switches in place of pots (Incidentally "two-knobs-per-finger" is genius). The encoders would be read by a microcontroller and fed into a Arturia Model D software via Midi, the Arturia has a feature to assign Midi commands to controls (but not sure if all controls can be programmed this way). Microcontrollers being the bread and butter part of my life, I'm not a Musician.

    • Thanks 1

    NSD - Behringer Model 15 (and Model D)

    in Other Instruments

    Posted

    I got a Behringer D when they were released, but being a 'patch junky' added some extra Behringer modules. I posted this elsewhere:

     

    http://www.hut-six.co.uk/Synth/trigger.html

     

    On Emerson's Modular, I remember a few videos of early ELP where Keith went to the modular and did not get anything like the expected sound and spent a few seconds turning knobs. There is one on SkyArts, which is ridiculously colorized in placed.

    • Thanks 1

    Reliable rechargeable batteries with active basses

    in General Discussion

    Posted

    On 24/08/2023 at 20:08, GlamBass74 said:

    I fitted the battery so only the negative terminal was touching the contact in the housing. 

     

    I then set up my multimeter and touched the leads in series between the positive terminal of the battery and the positive terminal in the housing 

     

    I read 6mA using this method. Seems about right to me (what do i know 😁)

     

    The reading dropped to zero when the 1/4" jack lead was removed from the bass

     

    Maybe I was just unlucky with 2 batteries, but i'm not the first to experience this from a few google searches

     

    Odd....

     

     

    Only ever had a SR500 active bass. Seems hard to flatten the battery (but did not leave plugged in on standby). I read  a little under 1.5mA using same method, so a lower drain bass. It is pushing it a bit to design electronics to run on 9V, 18 would be better. So rechargeables,  NIMH and Lithiums are too low a voltage for a 9V circuit to function as designed.

    Incidentally, I bought a "trail camera" a few years ago. It came with some Energiser Ultimate Lithium batteries and these were recommended by the manufacturer, worked better than Duracells which were rubbish. It was the highest spec Energisers. These are not rechargeable so you get the full 9V, higher capacity. might be worth trying but maybe 6mA is a high discharge bass. I have a headless Ibanez, I'll get it out and measure it

    Less sustain on some fretted notes

    in Repairs and Technical

    Posted

    I think Fender admitted it was a problem with bolt on necks a while back, and they had no solution. But I heard there was a headstock clamp affair. Also Tungsten slugs fitted under the tuners. ? I  had noticed neck resonance can also vibrate open strings if not muted (if 4th or 5th)

    I suspect laminated necks don't have this problem, being more rigid.

    Just bought a concert ukulele and  f# is quite dead but it is a bit of a plunk, plunk sound anyway.

    Get in... a 'new' Fender line up!

    in General Discussion

    Posted

    14 hours ago, Dad3353 said:

    When introduced as a 'new, improved' Telecaster model, the Thinline cost roughly two week's wages ($375; average US salary at the time : $7800...). Things have changed...
    Wasn't nitro-cellulose deemed a health hazard a while back, and phased out, generally..? How 'green' are the 'new' 'vintage' finishes (or doesn't that worry some Americans any more..?)..? :/

    Everything is carcinogenic in California. Can't remember what I bought recently - but it had a warning.

    Geddy's "Mogue"

    in General Discussion

    Posted

    On 14/02/2023 at 18:12, Bunion said:

    So not geddy’s then but a restored moog ‘signed’ by geddy 😄

    There have been a number of similar raffles over recent years, probably one a year, with a restored  MiniMoog each signed and donated by a esteemed musician. Most seem to be primarily keyboard players. Who knows?

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