A. Russell, Treble Booster w/ Inductor, Practical Electronics, April 1972 🇬🇧
- jrod
- Resistor Ronker
Does anyone know the origins of the project?
I have seen the entire article somewhere that explains the circuit, but can't seem to find it again. It looks interesting with the inductor. There is a simple vero layout, too.
The schematic and vero are attached.
Thanks!
I have seen the entire article somewhere that explains the circuit, but can't seem to find it again. It looks interesting with the inductor. There is a simple vero layout, too.
The schematic and vero are attached.
Thanks!
- Attachments
-
- TREBLE BOOSTER MAGAZINE VERO PROJECT.pdf
- (88.61 KiB) Downloaded 687 times
- mictester
- Old Solderhand
Information
The problem with using an inductor is that it will be prone to picking up magnetic hum. Also, inductors can be fragile, and expensive. A simpler approach is to use a frequency dependent bypass for the emitter resistor in a simple transistor amplifier:
Obviously, you can change the value of the 4k7 emitter resistor and the 47n capacitor to alter the frequency response.
Obviously, you can change the value of the 4k7 emitter resistor and the 47n capacitor to alter the frequency response.
"Why is it humming?" "Because it doesn't know the words!"
- mictester
- Old Solderhand
Information
I'm fairly sure it came from "Practical Electronics".jrod wrote:Does anyone know the origins of the project?
"Why is it humming?" "Because it doesn't know the words!"
- mictester
- Old Solderhand
Information
It's used as a crude high pass filter.jrod wrote:Thanks for the schematic and info, mictester. I was also thinking Practical Electronics.
Is the inductor used to get the treble frequencies? I think I like your approach better!
The other approach is to make the input coupling capacitor smaller than it should be, so that treble frequencies get through more than lower ones. You then recover the lost level with a simple single stage amplifier. That's the approach taken with the "Rangemaster" and several other products, but can only give a slope of 3 dB per octave. Other methos can give 10 dB per octave!
"Why is it humming?" "Because it doesn't know the words!"
- jrod
- Resistor Ronker
Interesting! Thanks for the help and info!!!mictester wrote:It's used as a crude high pass filter.jrod wrote:Thanks for the schematic and info, mictester. I was also thinking Practical Electronics.
Is the inductor used to get the treble frequencies? I think I like your approach better!
The other approach is to make the input coupling capacitor smaller than it should be, so that treble frequencies get through more than lower ones. You then recover the lost level with a simple single stage amplifier. That's the approach taken with the "Rangemaster" and several other products, but can only give a slope of 3 dB per octave. Other methos can give 10 dB per octave!
- kaycee
- Solder Soldier
Had a go at this one, very nice booster indeed The single dial provides a useful range adjustment/kind of a tone control. I'm assuming this has a high input impedance as it really makes the guitar pickups ring out nice and clear.mictester wrote:The problem with using an inductor is that it will be prone to picking up magnetic hum. Also, inductors can be fragile, and expensive. A simpler approach is to use a frequency dependent bypass for the emitter resistor in a simple transistor amplifier:
Obviously, you can change the value of the 4k7 emitter resistor and the 47n capacitor to alter the frequency response.
I went old school on the boxing up of this one, I put it in one of those folded steel project enclosures somewhat like the Rangemaster ones. No bypass on this, the slide switch simply turns the power on, so its either on or not - its very nice so for cleanish tones I can see me having this on all of the time. I put the Cornish buffer in front of it just because I had the board laying around and was tidying up my odds and ends, you don't need it, the booster on its own is just dandy.
- mictester
- Old Solderhand
Information
Excellent! I'm glad you like it!kaycee wrote:Its not the one from the magazine article, but from the schemo Mictester posted using the BC109 transistor.
I have one here, which my Wife calls the "Jangly Box" because it gives that nice 60s jangle with my Rickenbacker!
"Why is it humming?" "Because it doesn't know the words!"
- kaycee
- Solder Soldier
Yes, I found it very nice with a Tele on the bridge through a compressor (JangleBox clone). I like it better than my various Rangemasters - Shock Horror You have another version up somewhere on here that doesn't have the 10k on the input and has a 2u2 out from the collector and no cap across the pot, thats nice too.
- DeanM
- Resistor Ronker
Hey man whats that enclosure? and did you paint it yourself or buy it painted? its very cool!kaycee wrote:
Actually it looks like a chassis from maplins?
http://www.maplin.co.uk/aluminium-boxes-1728
- DougH
- Transistor Tuner
Another variation of a frequency-dependent bypass:
I implemented this on my build of Gus Smalley's NPN Boost. Re is end lugs of gain control pot. Wiper goes to the range control circuitry.
I implemented this on my build of Gus Smalley's NPN Boost. Re is end lugs of gain control pot. Wiper goes to the range control circuitry.
"You have just tubescreamered or fuzzfaced yourself " -polarbearfx
- modman
- a d m i n
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Here is the complete article, from Practical Electronics, April 1972
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- Manfred
- Tube Twister
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Interesting, a different treble booster circuit.
Here the data of the transformer:
https://www.petervis.com/electronics/lt ... ormer.html
Here the data of the transformer:
https://www.petervis.com/electronics/lt ... ormer.html