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Prairie Instrument Works: Preamp: Prairie 10LS/1LB
http://prairieboxes.blogspot.com/2008/10/preamp-prairie-10ls1lb.html
Monday, October 20, 2008. I started out with the idea to make a tube DI box for the '63 Dano Baritone guitar I ordered. It turned out that the Dano was long delayed and the order was eventually canceled, due to some manufacturing problems. I continued with the project as a bass DI. I threw in a microphone input for laughs. The circuit evolved. A starting point was the Altec 1566 preamp. Uded a version of the pentode screen "squish" control from the AX84 Blues Preamp. I used two 6 VA Hammond 229. Was moun...
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Prairie Instrument Works: July 2011
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Sunday, July 3, 2011. Grounding and Shielding a Danelectro '63 Baritone. Supposedly the electronics in the original Danelectro guitars were very heavily shielded. When I bought this reissue '63 Dano baritone, I was more than a little disappointed that aside from the "lipstick" pickup covers, the instrument was practically unshielded. The back of the pickguard had a skimpy little strip of aluminum tape between the controls. It wasn't a great surprise though, as this is. A very noisy instrument. I adapted ...
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Prairie Instrument Works: December 2012
http://prairieboxes.blogspot.com/2012_12_01_archive.html
Sunday, December 23, 2012. Forking to a New Blog. In order to keep this blog focused on the technology of musical sound, like instrument and musical electronics building, I will be starting a new blog shortly. It will still cover some music-related topics, especially the "independent" music business and related tools. The new blog will be found here: Oak Blood Three. Links to this post. Subscribe to: Posts (Atom). View my complete profile. Oak Blood Three (my other blog). Forking to a New Blog.
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Prairie Instrument Works: March 2010
http://prairieboxes.blogspot.com/2010_03_01_archive.html
Sunday, March 14, 2010. Last Christmas, I got my wife a Creative Zen X-Fi 2. Media player. It came with one game, Sudoku and the Creative labs website didn't have any others to download; recently a little searching showed that they had released an Application Development Kit. For the player. The kit is really just a simulator and a document describing the API. Programming on the X-Fi 2 is done with the text esditor of your choice in Lua. Links to this post. Subscribe to: Posts (Atom).
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Prairie Instrument Works: November 2008
http://prairieboxes.blogspot.com/2008_11_01_archive.html
Friday, November 21, 2008. Teaser: Lama Kazu 12PP. It may be a while before concrete evidence of the next electronic project shows up here, but here's a little teaser and progress schematic for the next amplifier, the Lama Kazu 12PP. It will be a 15-ish watt push pull with 6CM6s. For the output (they're 6V6s in noval bottles). The preamp will be:. Gain control - 12AV7. Gain stage (DC-coupled between sections) - Tone stack (Probably BM-Π) - Volume control - Sunn/Dynaco style 6AN8. Links to this post.
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Prairie Instrument Works: December 2008
http://prairieboxes.blogspot.com/2008_12_01_archive.html
Monday, December 1, 2008. Furniture Update: Studio Desk. Here's an update on the Foray into Furniture. The drawer is made with birch plywood prefab drawer sides from Rockler (they come precut to width, with a routed groove for the bottom panel). I used an inexpensive Wolfcraft dovetail jig to make the drawer box. Side mount drawer glides attach to the upper rails. The only screws used are on the drawer glides and to attach the drawer front to the box. This last photo is unrelated to the studio desk. ...
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Prairie Instrument Works: May 2015
http://prairieboxes.blogspot.com/2015_05_01_archive.html
Sunday, May 31, 2015. An Op Amp and Diode Ladder Clipper. My recent series of posts about Fred Nachbaur's “Dogzilla” diode limiter. When the output voltage is near 0, all four diode pairs are effectively open circuits, so the gain is determined by: A = - (R1 R2 R3 R4) / Rin. As the output voltage increases in magnitude, the voltage across the largest resistor (in this case R4) will be the first to reach a diode forward drop, at which point D7 or D8 (depending on polarity) will turn on and the gain after ...
prairieboxes.blogspot.com
Prairie Instrument Works: Amplifier Tweaks: Lama Kazu 8SE
http://prairieboxes.blogspot.com/2008/05/amplifier-tweaks-lama-kazu-8se.html
Saturday, May 3, 2008. Amplifier Tweaks: Lama Kazu 8SE. The Lama Kazu 8SE. Was revised last fall; I never got around to mentioning it here until now. The revised schematic is at right. Most of the changes were to reduce the gain, smooth out the overdrive character and clear up some blocking distortion. V2 was changed to an ECC832. JJ's equivalent to 12Dw7. With the high-μ triode at the input and low-μ triode at the driver stage. V1 was changed to an ECC81. Subscribe to: Post Comments (Atom). Amplifier Tw...
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Prairie Instrument Works: February 2010
http://prairieboxes.blogspot.com/2010_02_01_archive.html
Monday, February 22, 2010. One way or another, the next major project will probably involve microcontrollers. Reconfigurable tube guitar amplifier. Based on the Karplus-Strong algorithm. US Pat 4,649,783. A standalone MIDI synthesizer module, though not necessarily simulating plucked or struck instruments. I'm thinking monophonic, bowed sounds with natural hammered-on slurs. Projects 1 and 2 could use Arduino. Or one of the tiniest PICAXE. Controllers which are easy to program, but 3 would require a DSP.
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Prairie Instrument Works: March 2011
http://prairieboxes.blogspot.com/2011_03_01_archive.html
Wednesday, March 23, 2011. Discrete SS Mini Amp. Do you have a desire to build a fractional-watt miniature solid-state guitar amp? Apparently many people do, since there are several schematics out in the wild on the DIY discussion boards. For some reason, they tend to be built around little "chipamps" like the LM386 and its successors. They work off a 9V battery and are pretty easy to build. Make magazine even featured one version that was assembled into a cracker box. Links to this post.
