Reinventing the wheel!

Stompboxes circuits published in magazines, books or on DIY electronics websites.
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~arph
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Post by ~arph »

That is also what I have a scan from.
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Post by borislavgajic »

analogguru wrote:yep, that´s the Elektor design from the mid-80´s I was talking about.

analogguru

was there a PCB in article?
:?:

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Post by analogguru »

Yes, there was. When I find some time I have to look in my archive.
I even built 2 delay pcbs (4 stages) and added some mixer stuff to it. How it sounded ? Hmmm..... this was more than 25 years ago..... but as far as I remember .....after this long time, I think it sounded.....hmmm... it sounded like.... I think it sounded like a..... Phaser ! :wink:

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Post by borislavgajic »

analogguru wrote:Yes, there was. When I find some time I have to look in my archive.
I even built 2 delay pcbs (4 stages) and added some mixer stuff to it. How it sounded ? Hmmm..... this was more than 25 years ago..... but as far as I remember .....after this long time, I think it sounded.....hmmm... it sounded like.... I think it sounded like a..... Phaser ! :wink:

analogguru
I was 10-12 years old then :)
thank you AG.... :thumbsup

what was the reason for not having more famous phasers made this way??? :?: :idea: cheap nice sounding.....?

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Post by analogguru »

borislavgajic wrote: what was the reason for not having more famous phasers made this way??? :?:
There were more phasers made this way, for example the Korg KPH-401 from the PME-40X. Fostex even built a compressor with this technology, the model 3070.
:idea: cheap nice sounding.....?
I think the reason why this technology came out of use was the "digital era" which started at this time - even more cheaper compared to the possibilities.

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Post by earthtonesaudio »

An alternative "reinvented wheel" possibility along the same lines is the switched-capacitor "resistor." Like the PWM method, it requires both an LFO and HFO. However, instead of varying pulse-width to change resistance, you vary the frequency. It can also be done with CMOS analog switches, but there are also switched capacitor ICs available with some nice features.
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Post by Hotrats »

analogguru wrote: Fostex even built a compressor with this technology, the model 3070.
... wouldn't happen to have a schem you could post by any chance ?!
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Post by mictester »

Hotrats wrote:
analogguru wrote: Fostex even built a compressor with this technology, the model 3070.
... wouldn't happen to have a schem you could post by any chance ?!
I have a PWM limiter design that I'll put up here later today.
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Post by Dirk_Hendrik »

earthtonesaudio wrote:An alternative "reinvented wheel" possibility along the same lines is the switched-capacitor "resistor." Like the PWM method, it requires both an LFO and HFO. However, instead of varying pulse-width to change resistance, you vary the frequency. It can also be done with CMOS analog switches, but there are also switched capacitor ICs available with some nice features.
MXR envelope filters come to mind, especially the curren Auto-Q's
Sorry. Plain out of planes.

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Post by Dirk_Hendrik »

analogguru wrote:Yes, there was. When I find some time I have to look in my archive.
Save yourself the trouble ;)
http://yusynth.net/archives/Elektor/Phaser-1983.pdf
Sorry. Plain out of planes.

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Post by borislavgajic »

Dirk_Hendrik wrote:
analogguru wrote:Yes, there was. When I find some time I have to look in my archive.
Save yourself the trouble ;)
http://yusynth.net/archives/Elektor/Phaser-1983.pdf
:)
thanks mister Dirk :thumbsup

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Post by HEAD »

Hi,

any further news yet? Don't want to be unpolite though.:)

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Post by HEAD »

HEAD wrote:Hi,

any further news yet? Don't want to be unpolite though.:)

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Bump? :oops:
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Post by remork »

bump +1?
got my eye on this thread..
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Post by mictester »

remork wrote:bump +1?
got my eye on this thread..
I've had a major computer disaster, with a rogue power supply destroying a RAID array and a motherboard. I'm currently building my system again from backups, but this is taking a while because the full-time job has become crazily busy recently. I'll be posting a whole lot of stuff in the next week or so, so keep an eye on the threads I've been contributing to....

Also - I'm NEVER going to trust a switched-mode power supply ever again! Both my desktop PCs are now powered by good, old fashioned linear power supplies with crowbar over-voltage protection!
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Post by remork »

ouch!
so far i've never had to experience such issues.. i feel for ya :|
will be patient
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Post by soggybag »

Very interesting idea. similar to the MXR Envelope filter, I think MXR also made a phaser that used a 4066 PWM control.
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Post by stringsthings »

HEAD wrote:
dutom wrote:Hello!
found this at http://www.synthdiy.com/: 6stage Audio Phaser project 447 in Electronics Today International 1976.
I´m curious about the inventions of mictesters version :lol:
Audio Phaser eti447.pdf
Uuuh, thank you well! Nice! Maybe I'll give it a try though the use of 8 single op amps is a bit.... outdated.:D
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Post by marin »

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Post by HEAD »

:popcorn: :oops:
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