<p>I hope this makes sense because I am very sleepy, and also now I have several drone style boards on bench and I tend to mix them together in head. But, Casper's Drone Lab i GREAT. Lots of fun. Oh, and you can REALLY REALLY screw up the sound coming out of it, beyond using the normal controls, I have had mine bent to where oscillators are modding other oscillators or shorting a path between the tremolo oscillator, the bandpass and any random oscillator, I can get growls, rumbles, ear piercing squeals, flange sounds, also what my sons call farty sounds. I hope one day life will not be so hectic and I can document (unlike below) some nice mods and give them to casper and he can decide to post them after he decides if they are crap or not. Main problem is time lately. I am also trying to release my sound toys (I noticed how Casper mentioned Lunetta :) well think along those lines....well not really Lunetta but lots of CD4000 series CMOS, then going to other end of spectrum and a module that uses a ARM proc along with a DSP, fun fun)</p>
<p>Oh another caveat. If you don't want a bunch of jacks but do want some fun with CV changes on the individual oscillators you can make a patch system to send the output of any osc to the input of any other osc for great fun :). Working on a diagram and instructions for hard sync also but its a bit more involved. (HEHE remember there is a left over oscillator :) ). Two switches, the left over osc and two diodes and you are in business :) Ok I will quit blabbering and give my meager instructions to the schematic above.</p>
<p>Basically the easy way to do it is this way....(I suppose).<br />
1. If you want attenuation of the incoming CV signal you are going to be stuck with just positive bias. The problem is the PSU is not designed with negative voltages. Otherwise you can do like they did in schematic and have it bias the signal bipolar.</p>
<p>So to do this first part: run a +9v line to an outer leg of a 100k pot. On the opposite side run the leg to ground. From the center leg of the pot run a 100k resistor. This we will call section (a).</p>
<p>2. Get a jack be it banana, 1/8", 1/4", whatever floats your boat. Run from the tip connection of it to a 100k resistor. Call the section (b)</p>
<p>3. Get a 2.2k resistor run it to ground. Call this section (c)</p>
<p>4. take the unconnected ends of section a,b,c hook them together and run it into the base leg of a 3906 transistor (can be any type PNP resistor you can get, radio shack has a bunch).</p>
<p>5. From the emitter leg run it to BOTH the base of a 3904 NPN transistor (once again any type will do) and also run it to a 100k resistor that then connects to +9v.</p>
<p>6. on the 3904NPN transistor, on the emitter run it to ground.</p>
<p>7. on the 3904NPN transistor, on the collector HERES WHERE THE FUN STARTS!</p>
<p>Basically this is 1 CV input. You have 4 oscillators to run it to (also got lots of other fun spots to run it to, but thats for later. Casper basically (I think if i remember) has the basic oscillator setup for the 40106 setup. basically it involves using a capacitor and a resistor in a loop between the in and the out. You want to leave all this alone. All you need to do to add your cool new CV in is attach the collector of the 3904NPN transistor to the in on the 40106.These would be pins 1,3,5,9,11,13. One of the oscillators on the 40106 is not used on the Drone lab (crazy fun you can use this for later :)). One is used for the tremolo.</p>
<p>I hope this made sense and did not confuse anyone. This by the way is for exponential control over the 40106.
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