Showing posts with label A-147. Show all posts
Showing posts with label A-147. Show all posts

Thursday, October 10, 2013

SiteTip: Mheontube YouTube Channel

It looks like another Eurorack fan has hit YouTube...
Mheontube started to upload interesting short Eurorack snippets since yesterday, basic patches made with a small setup of only 4 Doepfer modules (so far)...

Check the full playlist (the last 7 videos were uploaded in one day) HERE

Video 1: Chirp Chirp Analogue by mheontube

-no description available

Video 2: Android's Talk by mheontube

-no description available

Video 3: Grumpy Android by mheontube

-no description available
Uploaded by mheontube (subscribe!)

Friday, June 01, 2012

New Doepfer Re-Designs Due to CA3080 Shortage


After the unplanned re-design of the Dark Energy (due to the unavailability of the CEM3394 chip ) there now seem to be more re-designs of Doepfer Modules coming up.

This time the problem is the availability of CA3080 (and 3080E) chips.
The CA3080 (datasheet PDF) is a 2MHz Operational Trans-conductance Amplifier (OTA), which is used in quite a few Doepfer (and other brands) modules and there seems to be no direct replacement equivalent.
The original chip itself hasn't been produced since 1975 and the wafers have all been used up a couple of years ago, according to some sources.
No-one seems to have decent stock anymore, and there was a buying craze when it went out of production.

That does mean that some Doepfer modules have to be re-designed in the near future because of this obsolete integrated circuit ( like the A-107, A-116, A-127, A-130, A-131, A-132-1, A-141, A-142-1, A-147, A-171). 

This will take a lot of precious time for Doepfer that would otherwise be spent on manufacturing new modules.
Sadly these re-designs will not have any obvious benefit for the customers.

Saturday, May 07, 2011

LFO's A-145 and A-147

Low Frequency Oscillators or LFO's produce periodic control voltages that can be used as a modulation source for all kinds of other modules.

The A-145 LFO1 was the first and one the most basic single Low Frequency Oscillators that Doepfer sold.
It provides 5 different waveforms; sine,sawtooth, triangle, pulse and inverted sawtooth ,and each waveform has their individual (and simultaneous) output.
With the Frequency-knob and the 3-way switch you can select a wide range of frequencies, from on cycle every minute up to audio frequency at the highest.
A reset input allows you to synchronize the LFO signal to an external trigger signal and each trigger will re-start the waveform from its zero-point.

The most obvious use for an LFO is to do some pitch modulation on a VCO to create a vibrato and to modulate amplifiers (VCA's) for a tremolo effect, but with a creative mind you can use these two modules for all kinds of sound manipulating.

The A-147 Voltage Controlled LFO is basically the same LFO as the A-145.
It doesn't have one of the A-145's sawtooth waves, but does have an extra Control Voltage input that is very useful.
Think of an A-174-2 Wheels Module or A-174-1 Joystick Controller as the most used control voltages, but dare to think further... how about controlling the A-147 frequency with noise or perhaps another LFO for example?
My personal favorite use is to put a voltage of an A-198 Ribbon Controller or Theremin Voltage though the CV input and send it to an VCA to get a tremolo effect, but at a higher frequency in the higher notes.

I will discuss the A-146 LFO2 in a future post because it is a slightly different module with different features and uses.

Sunday, March 28, 2010

Best Friends Forever I

Van PatchPierre

A few times a year i unwire my whole A-100 system, it's like putting up a fresh canvas. New inspiration, new sounds in this case.

There are a few thing i never unwire, because i use them that much.

My first example is this one; The A-174 Joystick and the A-175 Dual Voltage Inverter.
They both sit neatly next to each-other in my rack, and i always keep the two yellow cables between them connected. What a dynamic duo...

I use my A-174 the most for controlling the cutoff of filters or for controlling the speed of the A-147 Voltage Controlled LFO module

The A-175 is such a simple but effective module, and its inputs are internally linked, so you can use the other socket as a mini-multiple

This allowes you to have both control voltages and its identical inverted voltages available at the same time.