How DCOs work and differences between Juno 6 60 106 etc

There is an amazing video that explain this on YouTube:
https://m.youtube.com/watch?v=mqY6cVJS9fo
How DCO's work - GOLT ! Channel


After watching one can see that the Junos have just one clock oscillator but many voices of course. On the 6 and 60 it is analog. The clock on the 106 is crystal.


The Juno 6, 60 electronic wave is generated by capacitor discharge which is nice and smooth and exponential.

The M112 sound generator IC by SGS Thmpson used by Siel, EKO, Kentron Solton 24

An amazing underestimated perhaps microchip.


It is used on the EKO CL.61 organ synthesizer. Possibly on the EKO Pony too as they are similar.


It is used on Siel DK70, DK80, EX80 Expander 80 etc.


It's sound production is similar in many ways  to an Eminent Solina string ensemble.


The M112 gets a clock of 2MHz square wave. By various divisions a top octave synthesis TOS is made. Inside it are counters to divide every top note to create a full spectrum of 94 independent square waves.


These tones are apparently there, all the time and the internal 8 VCAs create 8 voices from them.


When data is sent to its data bus it controls which of all these tones must be switched to, multiplexed. Data bus commands include octave, note, envelope for VCA etc. In this way the M112 creates 8 microprocessor programable sound generator channels.


More on its data sheet by Googling just M112 sound generator.
The link is:
http://www.milton.arachsys.com/nj71/pdf/m112.pdf


It sound amazing and of course it is analog digitally controlled.

Υγιεινό Σουβλάκι; A Healthy Souvlaki?

With oyster mushrooms.


Με μανιτάρια πλευρώτους.


Πίτα ολικής χωρίς φυτικά λιπαρά.


Μανιτάρια πλευρώτους ψητά αλημενα με σουςαμελαιο η ελαιόλαδο, άνθος αλατου, τριμμένο πιπέρι.


Πίτα ψητή αλημενη με σιςαμελαιο.


Βάζουμε στην πίτα, ντομάτα, λίγο κανέλα, λίγο πιπεριά, τα μανιτάρια, τριμμένο πιπέρι.


Η αλλα λαχανικά αντί για ντομάτα και σουςαμι ολικής.

Υγιεινό Σουβλάκι; A Healthy Souvlaki?

With oyster mushrooms.


Με μανιτάρια πλευρώτους.


Πίτα ολικής χωρίς φυτικά λιπαρά.


Μανιτάρια πλευρώτους ψητά αλημενα με σουςαμελαιο η ελαιόλαδο, άνθος αλατιού, τριμμένο πιπέρι.


Πίτα ψητή αλημενη με σιςαμελαιο.


Βάζουμε στην πίτα, ντομάτα, λίγο κανέλα, λίγο πιπεριά, τα μανιτάρια, τριμμένο πιπέρι, λίγο μαϊντανό, ιςως λίγο τζίντζερ.


Η αλλα λαχανικά αντί για ντομάτα και σουςαμι ολικής.

Jean Michel Jarre on the importance of limitations

There is a great quote of Jean Michel Jarre on the importance of limitations in the Wikipedia article near to year 1997.

Many thanks to

Credit should go to:


Panos Diamantopoulos for bringing the idea and schematic of a K117 JFET preamplifier.


Lefteris Logaridis for bringing the idea of a VF14 (Neumann U47) preamplifier and the use of military signal transformers.


Both of these inputs as early as near 2000 gave a significant contribution to the development of the Pleiades microphone pre preamplifiers and filters.

The G spot

William Orbit says every synth has that little G spot where subtle, slight tweaking of two parameters takes you through a huge range of sound.


Women seem to like the album Ray of Light - Madonna.


Could it be that women instead of the G spot possibly behind their clitoris that they have a G spot in their brain?


Reference:
Interview with William Orbit on the making of Ray of Light - Madonna, Keyboard Magazine July 98

How to build a very simple Pleiades low noise tube microphone pre preamplifier booster with an ECC82

Πως να φτιάξετε έναν προ προ ενισχυτη μικροφώνου με σωλήνες ηλεκτρονίων (λυχνίες κενού), χαμηλού θορύβου που λειτουργεί με μπαταρία.


Με δίκη σας ευθύνη.


At your own risk.


Take all precautions, we must be careful even with low voltages and batteries must have a fuse in series.


The microphone is connected to the primary of an input step up transformer (e.g. 1:14) through XLR connectors.


The stepped up signal voltage from the secondary is applied to the grid of the ECC82 (12AU7) through a coupling capacitor of say 10nF (according to how much bass cut is needed). The capacitor is important as it keeps the grid free.


The other side of the secondary is connected to ground -.


The cathode of the tube (valve) is connected to ground - too.


The grid is also connected to anode through a 10MΩ (Megohms) resistor to neutralize the existing negative charge on the grid when heaters are on, and to free electrons so that they can travel to the anode (plate) at very small anode voltages.


The anode is also connected to the primary of an output transformer (e.g. 20KΩ to 600Ω). The other wire of the primary is connected to the battery through a fuse holder and its fuse.


The secondary of the output transformer is the output and can be connected through XLR output connectors to the mic input of an ordinary microphone preamplifier as you would connect the output of the internal Neumann U47 amplifier of the condencer capsule.


One side of the 12V heaters is connected to ground -. The other side is connected to the battery through the fuse or a different fuse.


The amplifier was tested with amazing results with various dynamic microphones including an AKG D190.


Although the heaters of the 12AU7 are specified at 12.6 Volts the amplifier can be connected to a battery of 12Volts but also 6Volts! including the anode and you may find that you prefer the more easy, smooth and more detailed? sound.


At lower than specified cathode temperature apparently there is less electron cloud (steam) trafic, almost none temperature secondary emission effects from other electrodes (also because of the very low anode voltage). And the tiny signal still has in its service plenty of electrons to send it amplified to the anode.


You may experiment with a rheostat for various heater voltages i.e. temperatures and you may find a sweet spot where (thermal or shot?) noise is further reduced while signal is increased with great almost like an electron microscope revealing sound.


Pins 3 of the chassis XLRs are connected to the metal chassis box, (the extra pin on the XLR chassis connectors) and you can enjoy the smooth sound and complete absence of hum and other noises the battery operation offers. The battery should preferably be inside the box too to avoid radio frequency pickup. You may wind your own Pleiades transformers using Magnetec tape wound Nanoperm toroidal cores and you can vary the primary winding turns if you need to compensate for the proximity bass effect.


You may also like to experiment with an EF183 electron tube triode connected (i.e. anode, supressor grid and screen grid connected together). You may find that it can operate even with 3 volts for both heater and anode! Additional information on the Pleiades V6 preamplifier can be found on previous euroelectron post.


Setup:


AKG D190 at 2in - Pleiades ECC82 booster preamp - Realistic disco mixer - Sennheiser HD580