That’s followed by a anti-aliasing filter, and then the delay line. +12 V connects to pin 8 and -12 V connects to pin 4. There’s a buffer, from where the dry path goes off to the final mixer. Or you can just use a TL072 in which case there are only 8 pins and 1, 2, 3, 5, 6, and 7 are connected the same as with the TL074. You should connect pin 8 to pin 9, connect pin 13 to pin 14, and connect pins 7 and 12 to ground. If you use a TL074 you should not leave pins 8, 9, 10, 12, 13, and 14 dangling. They’re drawn in different parts of the schematic (or not drawn at all) but all are part of one IC. This RC time constant corresponds to an overall delay time of 11.9 ns ( is 2RC). (pins 5, 6, 7) there are two more not shown, pins 8, 9, 10 and pins 12, 13, 14, which are the two unused op amps, and finally there is this piece: This combined with a resistor value of 95.3 Ohms gives an RC value of 5.94 ns. There are five pieces to this one IC, here is one: And in fact a TL072 is shown on the stripboard instead of a TL074. Power to the circuit can be derived from a standard 12 volt transformer with rectifier and smoothing capacitor. It’s kind of silly to use a TL074 here unless something else is being added to the circuit that uses more op amps. A TL072 contains two, a TL074 contains four. OK… I said TL072 because only two op amps are used. These are bypass capacitors and while the circuit will probably work okay without them, it’s best to add them.
Ideally they should be located right next to those pins. Two 10 ♟ electrolytics, one from +12 V to ground and one from -12 V to ground, both located close to the power header, and three 100 nF ceramics, from +5 V to ground near pin 1 on the PT2399 and from +12 V and -12 V to ground near pins 4 and 11 on the TL072. I think that’s it for the power distribution.Įxcept that there really should be some capacitors added to this circuit. You see +5 V (from the L7805) is to connect to pin 1 on the PT2399. Tells you +12 V should be connected to pin 4 of the TL074, and -12 V to pin 11. (Not all modulars use ☑2 V, ☑5 V is rather common, but Eurorack and Kosmo use ☑2 V the Eurorack specification actually calls for +5 V to be supplied too, but usually Eurorack systems just distribute ☑2 V and if +5 V is needed it’s done in the module with a regulator, like this.) It’s providing power to a 5 volt voltage regulator (L7805), which is where the +5 V comes from.
This is a Eurorack style 10 pin power header:Ĭonnects wherever you see +12V marked, for instance here:
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