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skip to content home about impressum ← older posts coron wah-pedal w-220 posted on march 28, 2016 by nils now something completely different: coron guitar effect pedals yea right! a couple of years ago i was doing music and like any other guitarist i have amassed a pile of guitar effects. if you search the net for guitar effect pedals you’ll usually find tons of information including schematics and review. i have a wah which i wasn’t able to find much information for, so i decided to take it apart and do a technical review. the pedal was in need for a good clean-up anyway. the coron wah-pedal w-220. so first i have to admit that i haven’t played it much. wah is just not my thing. i mean – i totally love the sound, but i never got that hand/foot coordination thing going. if you open it up you’ll see that it’s mechanic is quite sturdy and similar to higher praised brands like vox or dunlop. also at the first look the circuit board looks like just another vox style two transistor wah. i wanted to find out exactly which schematic they’ve copied, so i dug a little bit deeper and i found: it’s not a 100% clone! there is more going on inside. quickly i drew out the schematic: what you see here is mostly the two transistor vox style wah. they use 2sc732 transistors. nice high gain transistors with excellent hfe linearity. the inductor only has half the inductance usually found in wah pedals, but that has been compensated by doubling c2 from 4.7µf to 10µf. quality film capacitors for all remaining caps in the audio path. the big 220nf caps have for sure been a lot more expensive than ceramic disk style caps. the feedback path remarkable however is the negative feedback path right at the bottom (r12, c6, r13). this is something i haven’t seen in wah circuits before and it’s quite clever: it is frequency dependent, so it linearizes the frequency response and lowers distortion a bit. the frequency dependency makes it much more pronounced in the low frequencies, so it kind of works like a presence control giving a tighter low-end. it also moves the wah bumps a bit up in the frequencies. here is a simulation of three pot positions with (green) and without (red) the feedback path: actual traces i have them as well: i did a small test by generating white-noise using my mbed lpc1768 board, dividing it down to around 0.3vpp and running it into the wah. i changed the pot values: both extremes and some in-between values. the output was sampled using my pc sound-card and converted to a spectrum using fft: the output is noisy, true, but you can see that the bump in the frequency response end up roughly at the same spots as the simulation. nice. but wtf is this? somehow it makes me wonder if the coron engineers actually knew what they’ve been doing: notice the resistor r12 (4.7k) and r13 (220k): they’re in series and have 10% tolerance. whatever r12 is supposed to do, it has no effect because r12 is smaller than the 10% tolerance of r13. also it’s not simply used as a jumper because there is no trace to jumps over either. this resistor is completely useless. and while we’re at it: the r9, the 47 ohm resistor right after the power source does nothing as well. it’s tiny compared to the 22k and 1k collector resistors, and these have a local bypass in c5 anyways. i could see it if the pedal would be powered from a wall-wart. in this case r9 and c5 would build a low-pass filter to get rid of power-source hiss, but this pedal doesn’t even have a plug for external power. only battery is allowed. there are a few wtf’s on the trace side of the pcb as well like needless ground loops and so on. but hey, not critical, it works, doing pcb in the 80’th was harder than today. measuring the inductor no technical review of a wah would be complete without taking a look at the inductor: i measured mine as about 320mh with 12.8 ohm series resistance. the bobbin is type ee-1916 and the core looks like to be laminated steel. the copper wire is very thin. i haven’t measured it, but it looks like 0.1mm style wire. for measuring the inductor i did nearly the same setup as for taking the frequency response curves. it’s super simple and doesn’t need any special parts: here is how: you take your inductor and a high quality capacitor of know value. you’re likely have an idea in what range the inductance is, so pick a capacitor that would result in a notch in the low audio range around 1khz or so. then connect these as a notch filter as shown below: now you use an audio editor like audacity, generate a few seconds of white noise and play them into the filter while sampling from the output. do a spectrum/fft analysis of the sampled data and a very deep notch will appear. this is the resonant frequency of your lc filter. to get from that frequency to the inductance just calculate as: l = 1/(4 pi^2 c f^2) and you’re done.. wrap up the coron w-220 is not a straight clone of the vox wah but a variation of it, it’s tighter in the low registers. this may be just what you’re looking for. in a band context you don’t want to compete with the bass player and if your guitar or rig is already on dark sounding to begin with this wah may be a good fit as well. build quality is on par with the flagships like vox and dunlop. they didn’t tried to squeeze the last penny out of the parts cost. these cheap 80th guitar pedals from asia tend to have bad reputation overall. sometimes this is justified, especially for the boss style knock-offs with the plastic housing (does your still has a working battery compartment?). sometimes they’re pretty good though and always worth a try. oh, for completes sake, here are the images i’ve used to trace the schematic from. you can directly overlay them to see the components and traces at the same time: posted in effects , guitar | 1 comment lpc microcontroller flash checksum utility posted on march 12, 2016 by nils wrote an utility to fix something annoying in my micro-controller work-flow. if you’re coding for the lpc17xx micro-controllers under linux using openocd and the gnu tool-chain you’re likely familiar with the following message during flashing: warn : verification will fail since checksum in image (0x00000000) to be written to flash is different from calculated vector checksum … this message won’t prevent you from flashing a working image because openocd will calculate the checksum on the fly. it will however prevent you from doing a verify of the data because verification will be done to the unpatched binary. if you’re working with mbed and the external compiler tool-chain you’ll likely have seen this output a thousand times: ***** ***** you must modify vector checksum value in *.bin and *.hex files. ***** here comes my lpcpatchelf utility into play: it will process an arm binary in elf format and fix the checksum. this will get rid of the messages and allows openocd to verify. the source-code is up on my new github: https://github.com/npipen/lpcpatchelf to use it, compile it and put it somewhere in your path. (you may have to install the libelf-dev package which i need to manipulate the elf files). once done you can process the files by just calling: lpcpatchelf -f mybinary.elf right after the linker call in your makefile. this calculates the valid checksum and updates the elf file in place. once done you can then use objcopy to get your .bin or .hex files if needed. the utility will work for lpc17xx and most other lpc micro-controllers by default. some lpc microc-controllers have a slightly different algorithm though. for example in the lpc20xx family the way the checksum is calculated is identical except that the checksum is placed at a different position. you can define this position by explicitly setting it via the the -c option. for example this call will patch the elf file for the lpc20xx family. lpcpatchelf -c 5 -f mybinary.elf i hope you find it as useful as i do. if you have questions just drop a comment below.. posted in uncategorized | 1 comment swp tracer/sniffe

URL analysis for hilbert-space.de

http://hilbert-space.de/?p=122#comments
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Domain: hilbert-space.de
Nserver: nsa7.schlundtech.de
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Status: connect
Changed: 2013-05-27T15:09:28+02:00

[Tech-C]
Type: PERSON
Name: sibylle helesic
Organisation: ItSy Webhosting
Address: weilerweg 12
PostalCode: 53859
City: niederkassel
CountryCode: DE
Phone: +49-163-6654555
Email: [email protected]
Changed: 2015-05-11T21:54:23+02:00

[Zone-C]
Type: PERSON
Name: sibylle helesic
Organisation: ItSy Webhosting
Address: weilerweg 12
PostalCode: 53859
City: niederkassel
CountryCode: DE
Phone: +49-163-6654555
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  NAME sibylle helesic

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