Sorry about mispronouncing "flanger" - it's a bad habit I've had since childhood. See the notes for details (double click on the video to the main page). I didn't do much with the cv inputs - I haven't experimented with them much yet except to see that they work.
Yes, sort of, but it's not much of a difference. Depending on the source material, the APF (all pass filter?) switch can make a slight difference - you can hear it doing something in this video, although the difference isn't much. Like wise with the invert switch.
Just curious, when you say they *should* be fine...how can we tell if the actually are fine? Not sure what these do in the circuit - anything we would notice if they were substantially less than ideal in this circuit? Anything audible we would notice?
Also I just soldered mine into the circuit and with my multi-meter I measure a voltage drop of ~.340-.355 in each one - is this what would be expected? I'm used to diodes measuring closer to .600 voltage drop.
Just curious, when you say they *should* be fine...how can we tell if the actually are fine? Not sure what these do in the circuit - anything we would notice if they were substantially less than ideal in this circuit? Anything audible we would notice?
Also I just soldered mine into the circuit and with my multi-meter I measure a voltage drop of ~.340-.355 in each one - is this what would be expected? I'm used to diodes measuring closer to .600 voltage drop.
Thanks!
Yes, that looks fine. Germanium has lower drop voltage and softer clipping than silicon.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Out of curiosity, what do these diodes do in the circuit? If I remember from my stompbox-building days they look to me like clipping diodes in an overdrive-type circuit. They are part of the resonance in this circuit, right?
jhaible wrote:
numbertalk wrote:
jhaible wrote:
1N34A should be fine.
Just curious, when you say they *should* be fine...how can we tell if the actually are fine? Not sure what these do in the circuit - anything we would notice if they were substantially less than ideal in this circuit? Anything audible we would notice?
Also I just soldered mine into the circuit and with my multi-meter I measure a voltage drop of ~.340-.355 in each one - is this what would be expected? I'm used to diodes measuring closer to .600 voltage drop.
Thanks!
Yes, that looks fine. Germanium has lower drop voltage and softer clipping than silicon.
I may be going blind. Quick question - the BOM lists 13 1N4148 diodes, but I can only find spots for 12 of them. Am I missing one somewhere?
I only found 12 at first as well, but when I started to solder in the ICs I found the 13th one I was missing - right near the LM13700. Is it possible you had also overlooked this one at first?
No, I just checked - there's still one diode sitting in my bag of 13 1N4148's I bought for this project. I actually printed out the sost_comp.pdf, and went through the whole thing circling and numbering all the diodes to make sure they were all accounted for, and there are only 12 of these kind. And as far as I can tell, everything is working on my flanger.
No, I just checked - there's still one diode sitting in my bag of 13 1N4148's I bought for this project. I actually printed out the sost_comp.pdf, and went through the whole thing circling and numbering all the diodes to make sure they were all accounted for, and there are only 12 of these kind. And as far as I can tell, everything is working on my flanger.
Interesting. Maybe I read your post and only put 12 in my bag when I sorted parts out, because I used all of however many I put in after I found that last one,
Joined: Apr 19, 2010 Posts: 346 Location: San Francisco, CA
Audio files: 13
Posted: Wed Aug 25, 2010 8:24 pm Post subject:
Hi, I have a general question that relates most immediately to the Storm Tide Flanger. Is it generally necessary to match transistors? Always necessary? Desirable? For example, the pairs of 550's and 560's in the Storm Tide?
I actually have a large bag of 550's to choose from (but only a few 560s I think), but I've never matched transistors before so I'm curious where its necessary.
Hi, I have a general question that relates most immediately to the Storm Tide Flanger. Is it generally necessary to match transistors? Always necessary? Desirable? For example, the pairs of 550's and 560's in the Storm Tide?
I actually have a large bag of 550's to choose from (but only a few 560s I think), but I've never matched transistors before so I'm curious where its necessary.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Joined: Apr 19, 2010 Posts: 346 Location: San Francisco, CA
Audio files: 13
Posted: Thu Aug 26, 2010 10:57 pm Post subject:
2 further questions:
1) I am unsure about what to do with BPol -- if I leave it unsoldered, the bounce polarity is one direction and if I add a jumper the bounce inverts? Is it that simple?
2) Can I use the LFO as a CV Out easily? I have room on my panel for another jack and my modular is in its infancy. I don't have a good LFO yet, so if it's as simple as running one more wire from the board to a jack it would make the SOST even more useful.
1) I am unsure about what to do with BPol -- if I leave it unsoldered, the bounce polarity is one direction and if I add a jumper the bounce inverts? Is it that simple?
Yes.
jumunius wrote:
2) Can I use the LFO as a CV Out easily? I have room on my panel for another jack and my modular is in its infancy. I don't have a good LFO yet, so if it's as simple as running one more wire from the board to a jack it would make the SOST even more useful.
As long as you run it into a high impedance input, that will work.
If you're loading it, the Slew waveform (mid position of switch) will be smaller in amplitude than the others, because it's not buffered.
- Old trick to use an on-off-on switch as a makeshift 3-throw switch: Run the signal that is selected in mid position straight around the switch like a bypass, but with high impedance - and then feed some *buffered* signals to the two on positions of the switch, overriding the unbuffered high impedance path. This relies on either high impedance after the switch (the easy case), or well defined mid range impedance and careful calculation of the resistor divider, in combination with a higher signal level at the source for the unbuffered high impedance path (what I used here).
To make a long story short: It will work, but you may have to adjust levels when switching from one waveform to the next.
And put a 1k resistor between the switch and your output jack, to avoid oscillations!
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Any thoughts about adding an SPST to switch between bounce polarities?
Sure. Use whatever you like - a jumper if you prefer one mode over the other, a front panel switch of you have the space and want both options, a pull-pot for the bounce knob if you don't have the extra space and still want the function.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
So I somehow missed that the LED was connected through off-board resistors - just making sure I'm reading your handwriting correctly - those are 8K2 resistors, right?
So I somehow missed that the LED was connected through off-board resistors - just making sure I'm reading your handwriting correctly - those are 8K2 resistors, right?
If you're using a 2mA LED.
(For 20mA, make that 820 Ohms, etc.)
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
Joined: Apr 19, 2010 Posts: 346 Location: San Francisco, CA
Audio files: 13
Posted: Sun Aug 29, 2010 1:36 am Post subject:
Thanks for the reply about the LFO Jürgen. I guess I'll see which comes first -- the electronics knowledge necessary to convert impedance etc, or the money to build an already designed LFO circuit.
So I somehow missed that the LED was connected through off-board resistors - just making sure I'm reading your handwriting correctly - those are 8K2 resistors, right?
If you're using a 2mA LED.
(For 20mA, make that 820 Ohms, etc.)
Actually what if it's a 30mA LED? Would the be 1K2?
jhaible wrote:
numbertalk wrote:
So I somehow missed that the LED was connected through off-board resistors - just making sure I'm reading your handwriting correctly - those are 8K2 resistors, right?
If you're using a 2mA LED.
(For 20mA, make that 820 Ohms, etc.)
FWIW I used a 30mA lumex led (the same kind that MOTM uses) and used the 8K2 resistors, and it works fine. I suspect a smaller value will make it marginally brighter.
my led keeps shining ,it don't follow any rate change or so,how can i fix that?
It's Power-On LED. It follows the change of your power switch.
It's connected - via resistors - to the Frequency pot because that's a pot that carries both positive and negative supply voltage at its ends, nothing more.
JH. _________________ "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)
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