Frantone - Vibutron [traced]
- KindaFuzzy
- Degoop Doctor
Finally found one of these, and there's a lot less inside than I thought. Full gut shot gallery here: http://www.flickr.com/photos/35422385@N ... 803855603/
Chips are ICL8038ccpd, ua741cp, tlc2262cp, and a 2n7000 mosfet. Tracing will be done soon.
Chips are ICL8038ccpd, ua741cp, tlc2262cp, and a 2n7000 mosfet. Tracing will be done soon.
- Bernardduur
- Transistor Tuner
Cool!
Does the speed knob works the other way around as the one I had in a while ago (too short to make a schematic of even take pics)
Datasheet of the ICL8038; precision wave form generator, cool!
Does the speed knob works the other way around as the one I had in a while ago (too short to make a schematic of even take pics)
Datasheet of the ICL8038; precision wave form generator, cool!
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- KindaFuzzy
- Degoop Doctor
Yeah, it's backwards and has a huge range of speeds from super slow to crazy fast. The sine/triangle/square switch makes a big difference too, but gets lower in intensity as you go from square to sine, which is a little disappointing.
- KindaFuzzy
- Degoop Doctor
- phibes
- Transistor Tuner
Information
Simple design but very cool! I've read about the sine feed of the 8038 being weak before.
GuitarlCarl - "TGP = The Gear Polishers"
Ken
Ken
- culturejam
- Old Solderhand
Information
Sweet! Sounds kinda like the function generator chip that C'bread used on that tremolo thing that I can't pronounce.
By the way, has anybody done the relay switching on any of the Frantone boxes? I don't recall seeing it fully traced, but surely must have. I think I will search for that now.
By the way, has anybody done the relay switching on any of the Frantone boxes? I don't recall seeing it fully traced, but surely must have. I think I will search for that now.
- mictester
- Old Solderhand
Information
I'd buffer the output from the "Blend" pot - it would guarantee that anything you load it with wouldn't affect the operation of the FET.phibes wrote:Simple design but very cool! I've read about the sine feed of the 8038 being weak before.
The 8038 is quite expensive and draws a lot of current. You can get the same result with a quad op-amp and a couple of Schottky diodes - I use the conventional comparator and Miller Integrator triangular-wave oscillator (used in most phasers and flangers for the LFO), and then an op-amp and diode-based shaper for a reasonable sine-wave output, and you can get the square output from the output of the comparator.
The "spare" op-amp in the quad package can be used to drive the FET.
I'll try out an experimental version shortly - it's going to use two TL074s and a V-FET . The FET will be a BS170 as I don't stock the 2N7000, but the results should be similar, but with lower current consumption. I like the "blend" approach for depth!
"Why is it humming?" "Because it doesn't know the words!"
- KindaFuzzy
- Degoop Doctor
The sine option is the most disappointing as far as depth goes for sure.phibes wrote:Simple design but very cool! I've read about the sine feed of the 8038 being weak before.
- KindaFuzzy
- Degoop Doctor
So I ordered some 8038s from ebay, and they didn't work, so I ordered some more from another guy and it looks like they don't work either. I measured the voltages on the one in the pedal, and it's pretty obvious even without using my scope, that on the three function output pins the voltage is jumping up and down like it should, but nothing when I breadboard the chips I got. I tried the 'test circuit' from the datasheet too, and no dice.
Anyone got any ideas to test these differently, or have a few working chips they want to send me to finish verifying the schematic?
Anyone got any ideas to test these differently, or have a few working chips they want to send me to finish verifying the schematic?
- KindaFuzzy
- Degoop Doctor
Got the audio part of the circuit verified, I fed it a square wave from a 555 and it worked fine. Just need to get some working 8038s and we're set.
- IvIark
- Tube Twister
Information
I just got some of these too from JunFang-Electrons on eBay. Do you want me to send a couple?
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- KindaFuzzy
- Degoop Doctor
You could, and I can send some parts in trade. Or you could just breadboard this sucker and confirm the schematic so I can dump this thing and get another pedal to reverse.
- IvIark
- Tube Twister
Information
If I get chance to breadboard it over the bank holiday weekend I will do, but I'm not sure how much chance I'll get with the kids also off If I don't get the opportunity I'll just send them out when the post office is open, you don't need to send anything in trade.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- IvIark
- Tube Twister
Information
That sounded really bad, I do love my kids really!
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- KindaFuzzy
- Degoop Doctor
Wow, how did I miss that?Duckman wrote:ICL8038CCPD - Small Bear @ $9.95.-
Thanks Mark, and I feel your pain when the kid has to stay home all day too, makes you appreciate grandma's babysitting even more.
- KindaFuzzy
- Degoop Doctor
Few months later and I finally got an 8038 from small bear, plugged it in and nothing's working, uhh. Then I started fooling around with some wires, and bang the thing starts working. As long as I connected the 9v+ to pin 8 only and not pin 6 like you're supposed to, it works perfectly. Everything dies if I connect pin 6 to 9v, or remove the pin 8 to 9v, and things speed up if you connect 7 to 8 like on the data sheet. No idea why, maybe the current drain from the crappy battery I was using went below the working voltage of the chip once it was hooked up right, but I used the same battery in the working pedal and everything was OK. The 4 other chips I got from ebay all behaved the same.
So I guess this thing is verified, sort of. If anyone wants some cheap 8038s for their own project let me know, I don't even think I'm going to build one for myself, I like my ten cent trem better.
So I guess this thing is verified, sort of. If anyone wants some cheap 8038s for their own project let me know, I don't even think I'm going to build one for myself, I like my ten cent trem better.
Hi guys...I'm having a hard time with this, I built it twice, it does not work...I built it from scratch the second time...EXACTLY the same sympthoms as the first
I can hear the LFO ticking, the IC does something as far as ticking goes, the switches do something to the ticking, pots as well
The only problem is that the signal is dry and does not tremolo...but the guitar passes through
Some thoughts please? Thanks!
I can hear the LFO ticking, the IC does something as far as ticking goes, the switches do something to the ticking, pots as well
The only problem is that the signal is dry and does not tremolo...but the guitar passes through
Some thoughts please? Thanks!
- greenskull
- Resistor Ronker
Did you lift pin six of the function generator?Razvan S. wrote:Hi guys...I'm having a hard time with this, I built it twice, it does not work...I built it from scratch the second time...EXACTLY the same sympthoms as the first
I can hear the LFO ticking, the IC does something as far as ticking goes, the switches do something to the ticking, pots as well
The only problem is that the signal is dry and does not tremolo...but the guitar passes through
Some thoughts please? Thanks!
I recently built this from the Effects Layouts blog and needed to remove pin 6 of function generator from power to work (as noted in a previous post).
Also getting distortion on sine and triangle settings.... anybody else have this problem with this particular layout?
http://effectslayouts.blogspot.com/2017 ... utron.html
fuck smooth tone, fuck eric johnson - Seiche