The Signal Clone is a 5×1 buffered mult for CV, gate/trigger/clock, or audio signals. One of the outputs is inverted. The circuit is built around six Opamp buffers, with one used to drive a bipolar LED to indicate signal polarity and level.
BOM:
Qty | Value | Device | Package | Description | Source 1 | Source 2 |
|---|---|---|---|---|---|---|
| 6 | 100n | Capacitor | 0603 | ! 0603 Package ! | ||
| 2 | 10u | Capacitor | 0805 | |||
| 2 | 1u | Capacitor | 0805 | |||
| 2 | M7 (1N4007) | Diode | DO214 | Polarity protection diode. | https://octopart.com/search?q=rectifier&start=0&category_ids=4226&specs2.2.values=SMA&specs2.330.numbers=(50__200)&specs2.313.numbers=1&sort=median_price_1000&sort-dir=asc | |
| 1 | Bicolour | LED | 3MM | Bicolour two-pin LED (red green) | ||
| 2 | 100K | Resistor | 0805 | |||
| 5 | 100R | Resistor | 0805 | |||
| 5 | 1K | Resistor | 0805 | |||
| 1 | 1M | Resistor | 0805 | |||
| 1 | 4K7 | Resistor | 0805 | |||
| 3 | TL072 | Opamp | SO08 | Almost any dual Opamp can be used. | https://octopart.com/search?q=TL072&start=0&specs2.2.values=SOIC&specs2.2.values=SO | |
| 6 | 3.5mm Audio Jack | THONKICONN | 3.5mm socket for Eurorack modular synths "Thonkiconn" style. | http://shop.erthenvar.com/collections/accessories/products/3-5mm-inline-jacks | https://www.thonk.co.uk/shop/3-5mm-jacks/ | |
| 1 | Tile power tail | "Futaba J" type power lead. | http://pulplogic.com/product/tile-tail/ | EBay |
Schematic:
Build Instructions:
Clean PCB with isopropyl alcohol to remove any manufacturing residues.
Solder the surface mount devices, then the power tail.
Add the LED and 3.5mm jacks.
The LED sits tightly between the two right-most jacks. The outer ground pin of the jack should be pushed against the body to make room for the LED before soldering.
Testing:
Check soldered connections for shorts, especially between the Opamp legs.
With a multimeter, check that there’s no shorts between the red, white, and black power leads.
Apply power and patch a bipolar (+5 to -5) LFO to the input. The LED should alternate colours and intensity with the LFO.
Check that each output is sending a copy of the input, and the inverted output is inverted.
Done!