What opamps did you use? if they are based on inputs that use transistors, like LM324 or LM321 a voltage follower need a resistor in the feedback, also the inputs should be grounded with a resistor otherwise the outputs will have some random voltage if nothing is plugged in. Even done good, taking every into account it still can output a small random but static voltage. I made mine is 4hp dual, 2 x 4, using 10 x PJ302M spaced 20mm vertically and bi-color leds.
@@MeeBilt That's what i thought on seeing their size on your pcb's, i got a few of them as well but i didn't knew they where so tiny. the NE5534 is a semi high end op amp, also transistor based, a example circuit in datasheet shows voltage follower configuration with 10k. the lm321 is pnp based a load on the output could pull it out of wack.
![PASULOL รามเกียรติ์ ตอนที่ 4 นนทกพบรัก [Ramakien Ep.4: Nonthok in love]](http://i.ytimg.com/vi/tMUQgmZzf_A/mqdefault.jpg)
Link to Tindie for this product:
www.tindie.com/products/tkilla64/buffered-multiple-eurorack-module-full-kit/
cool I need to get one of these
There are plenty in stock right now 😉
What opamps did you use? if they are based on inputs that use transistors, like LM324 or LM321 a voltage follower need a resistor in the feedback, also the inputs should be grounded with a resistor otherwise the outputs will have some random voltage if nothing is plugged in. Even done good, taking every into account it still can output a small random but static voltage.
I made mine is 4hp dual, 2 x 4, using 10 x PJ302M spaced 20mm vertically and bi-color leds.
The look like LM321s but the boards are populated already with surface mount resistors.
Yes, it's LM321s
@@MeeBilt That's what i thought on seeing their size on your pcb's, i got a few of them as well but i didn't knew they where so tiny.
the NE5534 is a semi high end op amp, also transistor based, a example circuit in datasheet shows voltage follower configuration with 10k. the lm321 is pnp based a load on the output could pull it out of wack.
@@MeeBilt TL074(k or m) or so is a tiny variant of the TL074. like 3/4 x 3/4 mm. it's also a different datasheet.