x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
There is a normal amount of clicking from the VCA that you can get with a normal x0xb0x or TB-303. However, I did get some excessive clicking on one of my x0xi0 boxes that I did not figure out yet (I'm in the process of moving and my studio is all packed up!). You can tell this because you can still hear the clicking when the volume is turned all the way down.I only have a clicking sound, which is issued by VCA i guess. Is that sound normal?
I haven't had this problem. Did you replace C20 and C21 with the 0.1uF caps? It should actually have an octave more bass than a stock x0xb0x.Another question i have is, the assembled devices has not the power in bass frequencies like my other xox'es. It misses a bit the pressure from the down
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
I just listened to the sample but only on my crappy laptop speakers so couldn't hear everthing. The clicking noise sounds like the VCA, you can try to trim it out by adjusting DC offset. I will listen again tomorrow on a real system. It sounds like you have enough experience with other x0xb0x's to say that this noise is worse or different than other ones.- How i get rid of the noise?
I'm not sure about this one. The whole sample doesn't sound right so there's definitely problems. How does it sound if you listen to the VCF out? does it sound better/correct? Double check R121 & R122 and make sure that the resistor values are correct and were not swapped by accident.- Why i dont have the pumping bass like i expect from xox (its not the vcf tune pot, i have checked it)?
Why vco1 and vco2 sound that different? Its the AP's i have installed? Where this edgy distorsion effects, which sound like bad ADC xould come from?
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
I can't find the 1n5232B
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
bcbox wrote:I just listened to the sample but only on my crappy laptop speakers so couldn't hear everthing. The clicking noise sounds like the VCA, you can try to trim it out by adjusting DC offset. I will listen again tomorrow on a real system. It sounds like you have enough experience with other x0xb0x's to say that this noise is worse or different than other ones.- How i get rid of the noise?
bcbox wrote:I'm not sure about this one. The whole sample doesn't sound right so there's definitely problems. How does it sound if you listen to the VCF out? does it sound better/correct? Double check R121 & R122 and make sure that the resistor values are correct and were not swapped by accident.- Why i dont have the pumping bass like i expect from xox (its not the vcf tune pot, i have checked it)?
bcbox wrote:Why vco1 and vco2 sound that different? Its the AP's i have installed? Where this edgy distorsion effects, which sound like bad ADC xould come from?
The VCO's should not sound very different. At most the square wave may have a slightly different character. From listening to the sample there is something wrong. There is also a lot of distortion as you mentioned (is this the headphone output only?) Listening to the VCO Out and then VCF Out the sound should be very good, clean with no noise at all. If the VCO's still sounds very different, distorted or funny check to make sure C405 & C406 are installed with correct polarity. Also check pad 6 and pad 9 on the x0xi0 Top pcb and make sure they read ~5.33V and ~11.9V (these pads are connected to the stock x0xb0x power supply) [Note: you can use any pad C for ground - all pad C's on x0xi0 pcb's are analog ground] Also check pad D on the x0xi0 Top pcb and make sure it reads ~11.9V. This is taken from the new 12V power supply that powers the whole x0xi0 mod except the VCO2 core circuitry (it does power IC401 in the VCO circuit).
the chirping at the end of the clip is just the filter self-oscillating. This can happen when resonance is close to max. You should not be hearing that much if the resonance control is less than 75% or Hi Resonance is turned on. The high-rate modulation you hear when VCO FM pot is adjusted (and VCO's turned off) is also just the filter cutoff being affect by the VCO waveform while the filter is self-oscillating. Also the filter tracking knob also effects the filter cutoff and will be audible when filter is self-oscillating.
I'll listen to the sample again tomorrow on real system and I'll be able to hear the problems better.
Re: x0xi0 Full Kit - Install & Troubleshooting
Re: x0xi0 Full Kit - Install & Troubleshooting
bcbox wrote:Step 1. Test each waveform output.
1. Select VCO1 & VCO2 waveforms as saw.
2. Adjust VCO1 & VCO2 Level to minimum.
3. make sure VCO sync is off (switch to left).
4. Plug a cable into the VCO Out jack. This will open the circuit between the VCO’s and VCF.
5. check the waveform at pin 3 of VR405. This the waveform directly from VCO1.
6. check the waveform at pin 3 of VR406. This the waveform directly from VCO2.
7. Do the same with square wave selected.
Does VCO1 look ok?
Does VCO2 look ok?
If VCO2 still looks funny goto step 2.
Step 2. Eliminate VCO2 linear freq modulation inputs.
1. Remove wire from pad 1 on the x0xi0 top pcb.
2. make sure Xmod control is at minimum.
3. select Xmod source as “1-2”
(This removes all linear frequency modulation inputs to VCO2)
4. check the waveform at pin 3 of VR406.
Lord BIX wrote:- turn on vco1
-> now you hear that there is almost no sound.. no pumping bass
Re: x0xi0 Full Kit - Install & Troubleshooting