Do you leave the power rails (ie. P-channel sources + protection diodes) unconnected or do you connect them to the gates that go to the LFO?I tend to use a 4007UBE, as the FETs seem much more robust
Ampeg - Phazzer [schematic]
- george giblet
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- pinkjimiphoton
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shit, forgot about it completely! let me see if i can find that suckah, i'll try and find and scan it today. sorry old friend!
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- pinkjimiphoton
- Transistor Tuner
Information
- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks - Location: new world order land (formerly la-la land)
- Has thanked: 358 times
- Been thanked: 480 times
- Contact:
here ya go!
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- BMS1971
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Interesting for two reasons:ppluis0 wrote: ↑22 Oct 2021, 19:01
Hi there,
Found this diagram in the web scanned from a 1976 National Semiconductor audio manual.
In the description of this unit explain that the condenser values of each stage are selected to spacing one octave apart, but in several phaser diagrams I've seen all the condensers in all the stages are of equal value. (Exception are the condensers of Uni Vibe...)
Cheers,
Jose
6 stage phaser
2 the possibility to stop phase and select it manually
Here's an email i got from the original designer of the Ampeg Phazzer, Donald Tillman after posting about it on the Tone Machines blog:
"This was manufactured by a company called "I W Turner", a very small music electronics company in the town I grew up in, Port Washington, New York. (That's on Long Island, just outside New York City.) This was a basement operation; literally, it was in the basement of a fabric store. It was a side project of the the local high school band director who had an inventor/entrepreneur streak. I was a nerdy kid, and I showed him some of my electronics work and he hired me part time to do some engineering there. The name is made up; the initials stand for the first names of the two partners, the Turner part was a family name that went well with it.
The company sold music electronics to schools. The first product was a metronome. And since synthesizers and electronic music was getting popular then, we made a set of modules to introduce elementary school kids to the rudiments of electronic music; oscillators, filters, etc.
At that time the phase shifter was the cool new guitar effect. (It changes the tone, but not in an obvious way.) We used an MXR Phase 90 as a model, and I reverse engineered it, and tweaked and improved the design a bit:
* replaced the individual FET's with a CD4069 chip, biased off so the internal FET transistors are available, it's cheaper and the FETs are matched
* better LFO circuit, the slow sweeps are smoother
* better mixing of the phased and original signals, better output drive
At the time, Ampeg wanted to get into the stomp box business, so we made a deal to build some number of units for them. (My memory is telling me it was 1000 units, but I'm not sure that's right.) And these were branded for Ampeg (clearly). Ampeg later decided not to get into the stomp box business, and seems to have found them in a warehouse and sold them off at some point."
"This was manufactured by a company called "I W Turner", a very small music electronics company in the town I grew up in, Port Washington, New York. (That's on Long Island, just outside New York City.) This was a basement operation; literally, it was in the basement of a fabric store. It was a side project of the the local high school band director who had an inventor/entrepreneur streak. I was a nerdy kid, and I showed him some of my electronics work and he hired me part time to do some engineering there. The name is made up; the initials stand for the first names of the two partners, the Turner part was a family name that went well with it.
The company sold music electronics to schools. The first product was a metronome. And since synthesizers and electronic music was getting popular then, we made a set of modules to introduce elementary school kids to the rudiments of electronic music; oscillators, filters, etc.
At that time the phase shifter was the cool new guitar effect. (It changes the tone, but not in an obvious way.) We used an MXR Phase 90 as a model, and I reverse engineered it, and tweaked and improved the design a bit:
* replaced the individual FET's with a CD4069 chip, biased off so the internal FET transistors are available, it's cheaper and the FETs are matched
* better LFO circuit, the slow sweeps are smoother
* better mixing of the phased and original signals, better output drive
At the time, Ampeg wanted to get into the stomp box business, so we made a deal to build some number of units for them. (My memory is telling me it was 1000 units, but I'm not sure that's right.) And these were branded for Ampeg (clearly). Ampeg later decided not to get into the stomp box business, and seems to have found them in a warehouse and sold them off at some point."
- BMS1971
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Yes I have seen it around with the name Cookbook phaser (name of the book I think). I was considering making one. The only change will be to use real FET instead of the impossible to find AM3909CNppluis0 wrote: ↑22 Oct 2021, 19:01
Found this diagram in the web scanned from a 1976 National Semiconductor audio manual.
In the description of this unit explain that the condenser values of each stage are selected to spacing one octave apart, but in several phaser diagrams I've seen all the condensers in all the stages are of equal value. (Exception are the condensers of Uni Vibe...)
Cheers,
Jose
Ben
- BMS1971
- Solder Soldier
Thanks for the idea to use CD4069 ! The Am9707CN are impossible to findedkoppel wrote: ↑19 Oct 2022, 02:34 Here's an email i got from the original designer of the Ampeg Phazzer, Donald Tillman after posting about it on the Tone Machines blog:
"This was manufactured by a company called "I W Turner", a very small music electronics company in the town I grew up in, Port Washington, New York. (That's on Long Island, just outside New York City.) This was a basement operation; literally, it was in the basement of a fabric store. It was a side project of the the local high school band director who had an inventor/entrepreneur streak. I was a nerdy kid, and I showed him some of my electronics work and he hired me part time to do some engineering there. The name is made up; the initials stand for the first names of the two partners, the Turner part was a family name that went well with it.
The company sold music electronics to schools. The first product was a metronome. And since synthesizers and electronic music was getting popular then, we made a set of modules to introduce elementary school kids to the rudiments of electronic music; oscillators, filters, etc.
At that time the phase shifter was the cool new guitar effect. (It changes the tone, but not in an obvious way.) We used an MXR Phase 90 as a model, and I reverse engineered it, and tweaked and improved the design a bit:
* replaced the individual FET's with a CD4069 chip, biased off so the internal FET transistors are available, it's cheaper and the FETs are matched
* better LFO circuit, the slow sweeps are smoother
* better mixing of the phased and original signals, better output drive
At the time, Ampeg wanted to get into the stomp box business, so we made a deal to build some number of units for them. (My memory is telling me it was 1000 units, but I'm not sure that's right.) And these were branded for Ampeg (clearly). Ampeg later decided not to get into the stomp box business, and seems to have found them in a warehouse and sold them off at some point."