MOOG OSCILLATOR DRIVER

Well, I suppose the slight difference is due to component variations. For practical reasons I recommend the solution with the component carrier even for these though. The 2SC is a good choice, if you can find it. The Invention and Impact of the Moog Synthesizer. Looking at the images we can see the IG VCO IC with a pink sticker on the left hand side and a diode stuck to the top of the chip with a blob of white thermal compound. Rare and tricky to find, beware of counterfeits on Ebay.

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The sparse dual envelope generator board. The key contact springs can be problematic if abused. So I think the annotation f is just wrong, and the other voltages given are consistent with each other. I think oscillahor assuming that the text “0.

Rick Wakeman of Yes would use five Minimoogs on stage so he could play different sounds without having to reconfigure the synthesizer. The UA heated transistor pair is used in some of the most famous vintage mono synths. The 2SC is a good choice, if you can find it. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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They were also used in some Aries and early E-mu modulars.

Moog 921 Oscillator

This deviation is however very minor, and already after 10 minutes it is almost in tune. For additional temperature compensation the VCO uses a 1 kohm temperature compensation resistor. CR2 prevents the output of opamp IC6 from having a voltage above 0.

Music News, New Music. The advent of micro computers in polyphonic synthesisers that finally allowed patch storage functionality was a real oscillahor for performing musicians.

Thanks for the suggestions; perhaps more detail could be given only by those who have themselves built and tested the circuit, a club I hope to join very soon.

Van Koevering used the building to host an event he billed as “Island of Electronicus”, a “psuedo-psychedelic experience that brought counterculture minus the drugs to straight families and oscillatr it with the sound of the Minimoog”.

InMoog Co released the Moog Voyager, an updated version of the Minimoog that sold more than 14, units, more than the original Minimoog.

Oscillators

IC8b has a bit of positive feedback to ensure a clean reset. Minimoog Model D Jun 16, For practical reasons I recommend the solution with the component carrier even for these though.

Sign up using Facebook. Electronics are very sensitive to temperature. At this point, the capacitor is discharged by Q4, and the drain of Q4 rises to 5V again. Although unintentional, this created the synthesizer’s “warm, rich” sound.

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The rare UA heated transistor pair IC.

That node is the output of an op amp that sums the control voltages for the oscillator, and is normally a DC voltage that determines the frequency, increasing by mV per octave.

Final test and oscillatro control sign off at the factory? Some of these chips were internally heated in an attempt to control the temperature. No hand-matching required if you use a matched transistor pair. The exponential converter uses a conventional NPN transistor pair and a tempco resistor that are potted together for best temperature stability.

Minimoog style VCO

Sawtooth, pulse, triangle and sine wave. Keeping it all in tune — Transistor arrays. Triangle and sine converter schematics. Synths this age often have odd modifications added over the years.

Rare and tricky to find, beware of counterfeits on Ebay. Mike Spivey 2 If you don’t use surface mount parts, you can solder the dual transistor and tempco resistor directly on the circuit board.