Defender, progress

Defender, 3 oscillators and revised panelI’ve long wanted a Memory Moog, but never had the money, nor the wish to spend a lot of time repairing one. Anyway, I had the good fortune to play with one at a friend’s that was in tip top condition (with full Lintronics modifications). Simply stunning.

In a room with every conceivable synth under the sun, the Memory Moog stood head and shoulders above the rest in both sound and quality.

I saw one on e-bay over Christmas and was very tempted, but, budget prohibited such a purchase. Anyway, this got me thinking about Defender. I mean, I already have a Moog Ladder filter in there, all I needed was three oscillators and PWM.

After a lot of hair pulling and cursing, I managed it. I squeezed 3 oscillators into the oscillator chip. So now Defender has 3 oscillators, with sawtooth, sine and pulse (with modulation) and 57 other waveforms (varieties?).

The remainder of the specs stay the same, 2 LFOs, 2 EGs, mixer and portamento. It dawned on me that the old panel would no longer be suitable. So I’ve re-designed it, probably much to the disgust of many synth geeks out there. I’ve reduced the knob count and gone for an Oberheim Xpander style interface.

Buttons select which part you’re editing and then the display changes to match the parameters for that section. The knobs above and below the LCD change the parameter on that portion of LCD. The buttons have LEDs built into them. The two smaller blue LEDs are the LFO level, I wanted to use green LEDS but didn’t have any in my parts bucket(s).

This allows me to experiment with the functionality of the synth, without needing a new panel to be designed everytime I have a new idea. Once the synth is stable, and has everything I want, I’ll design a more knobby panel for it.

In the meantime, You can listen to a short snippet here.

4 Responses to “Defender, progress”

  1. David Says:

    Why does the display just show ’40′?

  2. Paul Says:

    Good question, and well spotted..
    I was testing the buttons to make sure I’d wired them up correctly, the easiest way for me to do this was to simply display of the button latch on the LCD :-)

  3. KD Says:

    From where did you get the light’ed buttons Paul?
    And those nice Waldorf knobs!

  4. Paul Says:

    The buttons came from RJS electronics ( but you can buy them from Rapid Electronics (

    The knobs, well, they came from Waldorf :-)