Monday, October 28. 2013Links
http://nortonraceparts.com/
http://www.dtec.net.au/Ignition%20Coil%20Dwell%20Calibration.htm http://www.jetav8r.com/Vision/Ignition/CDI.html Monday, October 28. 2013Thursday, February 14. 2013Tuesday, July 17. 2012Yamaha TT350 tunausta/turausta
Hommasin taanna 1986 vuoden TT350 Yamahan....
6 voltin AC-s�hk�j�rjestelm� vaihdettiin 12 volti DC systeemiksi. K��mit otettiin XT350 mallista. Tasuri/regulaattori on tehty tasasuuntaussillasta isosta darlington transistorista, zener diodista ja konkasta. L�ht�j�nnite noin 16 volttia ja valo palaa miellytt�v�n kirkkaasti. Tarkempaa kytkent�� voivat halukkaat kysell� kommenteissa.  tasuri/regu  Modattu 12V staattori Sittemmin py�r� on myyty... Saturday, December 18. 2010Tonebender mk3
Slight modifications to my Tonebenderish fuzz. Put a pot in series with input. In minimum all input signal is fed to the first transistor. With high output pickups this can really drive the circuit in to deep saturation with some serious barf. At maximum it limits the current driving the first transistor. This cleans up the sound and gives a less fuzzy sound. Also dialing down the guitar volume a little bit cleans the "barf" nicely.
Friday, October 29. 2010Saturday, October 9. 2010Tankki Simson - Suhl Nätti kuin sika pienenä. Tuesday, September 14. 2010Wednesday, September 8. 2010XS650 projekti
30 vuotisen taiteilijauran kunniaksi päätin ostaa 30 vuotta vanhan moottoripyörän. Yamaha XS650:n eli tuttavallisemmin Jytä Jammun tahi Jytärin. Kunnostus/rakenteluprojektia pukkaa. Lähtötilanne oli kutakuinkin tämä:
 Yamaha XS650 SE US custom, vm. 1980 Sittemmin mopo on purettu osiin ja projekti jatkuu kutakuinkin seuraavin vaihein: Hiekkapuhallus + jauhemaalaus: - T-palat + tangon pidikkeet yms - Keulan alaputket - Vanteet - Jalkatapit - Runko - Takaswingi Rakentelua (/muutoksia): - Ketjusuoja - Akku/sähkökotelo - Satula - Takalokari - Mummorauta - Jalkatapit - Lamppu - Mittarit - Sähköt - Keulan lyhennys - Starttimootorin poisto - Rungon korjailut ja siistimiset Muuta: - Uusi ohjaustanko - Uudet sähköt - Uusi tankki - Jarruremontti Eiköhän siinä ole talveksi tarpeeksi puuhaa. Tuesday, September 7. 2010Monday, September 6. 2010My Nokia Booklet 3G / Ubuntu battle
I should have known better. At least two of my friends warned me that changing my Samsung NC10 to Nokia Booklet 3G is bad idea. At least when considering installing Ubuntu on it. What the heck, I have had battles before, I used to have some nice nights tweaking my desktop with older Nvidia and dualhead, Nvidia's legacy drivers and incompatible xorg ABI.
So, I got it running. I used 10.04.1 alternate install cd, cause I needed encryption also. First issue, at least for me, is that I could get only flashdrives created with Ubuntu's usb-creator-gtk working. I tried Unetbootin, I tried Pendrive Linux's usb creator. Latter didn't even boot, one created with Unetbootin didn't know how to install files from flashdrive, instead tried netinstall. Which didn't work for me, since Booklet doesn't have wired lan, and wlan doesn't work yet in installation. Good start! Problem was that I don't have any Ubuntu machines, since I normally use Debian. So I had to 1. Burn Ubuntu live-cd 2. Boot one of my laptops from it 3. Copy installation .iso to one flashdrive (since cd-live-laptop has only few hundred meg's free space) 4. Create install-flashdrive from another flashdrive  Ok, so ahead with installation. Nothing special there. It was too easy, it just worked. First boot, X resolution sucked. Known issue due to the buggy Poulsbo chipset. First, I followed instructions from https://wiki.ubuntu.com/HardwareSupportComponentsVideoCardsPoulsbo:
And rebooted. Now also native resolution worked like a charm. Bad thing is that with Poulsbo-driver, all kinds of power management issues comes, so following same page, I:
And rebooted. Now I could get suspend working with 's2ram --force'. Too bad that Ubuntu/GNOME doesn't provide directly options to change default suspend-command. So: 1. I replaced default pm-suspend with s2ram: 'sudo mv /usr/sbin/pm-suspend /usr/sbin/pm-suspend-old && sudo sudo nano /usr/sbin/pm-suspend'
2. Granted sudo-rights with NOPASSWD-option to admin-group users with 'visudo':
3. Created shortcut key ctrl-alt-p to execute '/usr/sbin/s2ram --force' 4. Changed s2ram as default suspend-command.
Then I played a bit with Power Management options in System - Preferences - Power Management, just to check that there's no "hibernate" anywhere, since I haven't tested '/usr/sbin/s2disk' (Suspend to Disk) yet. That's the next part. Also, I noticed that: 1. Flash's can't be played fullscreen, only white screen shows. Not a big issues though. 2. Thunderbird can't be used. If installed from repositories, it shows blank menus & co. It's described at least here: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/564011. Installing Thunderbird directly from mozilla.com did worked. I did:
Unfortunately, I got at least one kerneloop with thunderbird:
... So I swithced to claws-mail.... EDIT Seems that Thunderbird-issue (well, rendering-part, not the kerneloops-part) is described already here: http://ubuntuforums.org/showpost.php?p=9600101&postcount=1467 TODO - - - Test s2disk - Check if that another thunderbird works or not. Tuesday, August 31. 2010OptiVibe Mirco - a simple optical vibe/chorus/phaser/whatever
This is a simple 2-stage optical vibe-effect for guitar. I've wanted one for quite some time and now I built it. Mellow and subtle. Not "over the top". This "design" is an adaptation of various Internet sources. Hope you find it usefull. I did. Here are schematics and a VERO-board layout (in EAGLE format): optivibe_micro.sch, optivibe_micro.brd
 Schematic with comments Sunday, June 13. 2010Guitar speaker cabinet with Eminence Delta Pro 12A
A reflex cab with a pro audio speaker that is said to be close to the legendary Electro Voice speakers. The cab has approx 48litre internal volume. It is made from 15mm pine plywood. Covered with black felt. It is tuned to approx. 70Hz with 100mm diameter 30mm long tube.
 DD101 and the EDP12A cab The port has changed to bigger and shorter after the pic was taken. I'm still testing and getting used to the sound but initially it appears very neutral and un-colored with big bottom. Still needs steel corners and grille. Friday, March 19. 20103-knob Tone Control For Guitar And Bass Amps (a.k.a The TMS Stack)
I wanted a "different" tone control for my Low Gain Amp. By combining modified BigMuffPI tone with modified Marshall bass amp MID control I got this:
 Sounds nice. Gives bass/treble tilt and variable mid scoop. For nearly flat response (3dB mid scoop at 540Hz) set TONE to 1 o'clock and MID to full value. Change C23 to 2.2n for less than 1dB scoop. If you try this in your amp please let me know how it works for you. Pekka Thursday, March 11. 2010DD101 - The Low Gain Tube Amp
I got hold of an old PA/central radio amp few years ago. I wrote something about it to the old KP here. The amp was not working at the time but had some nice parts: Four EL34's, EF86 and ECC83 in preamp and huge transformers. Also a big and "good looking" (but a little bent) chassis.
Apparently the amp was made in Finland in 50's or 60's. Now the amp got a new life as a low gain (bass)guitar amp. It features two EL34 output tubes, 12AX7 DC-coupled PI and 12AX7 Preamp with Tilt. Mid and Volume controls.  Original condition Dis-assembly I traced out the schematic of the amp and decided that I would not use it as it is. I decided to dis-assemble everything. Most electronic parts went to thrash. Old can electrolytic caps and scary looking mains connectors had to go. Actually I only kept the tube sockets and two red lamps on the front panel. After removing all parts I removed most of the old paint from the chassis.  Finished amp Output transformer The OT was huge. It had UL-taps in the primary (actually 57% instead of 43%). The output transformer secondary was for 100V line. I disassembled the transformer core and wound 10 turns of wire over the existing windings. Then I fed a 1kHz signal to this 10 turn coil and measured voltages from all coils. I found that primary had approx. 2000 turns of wire. I calculated secondaries so that I got approx. 6kOhms primary impedance. 76turns for the 8ohm output. I was supposed to measure the tranny but did not have the patience for that. I assembled it to the chassis and wired to the circuit.  Hand wound secondary... Chassis The chassis is a true classic. Huge and ugly. Bent and scratched. Originally the chassis was painted with blue hammer-tone but someone had painted it over with some white paint. Latex or oil based paint used to paint interior walls in houses or something. I wanted to keep something original in the amp so I painted the chassis with something that claimed to be "Black Hammertone" in a spray can. Well, not quite. It is actually gray and does not look like hammertone. You cant win every time... I did not have to drill any new holes except for the new IEC socket. Schematic  Schematic 1.5  Schematic 1.3 UPDATE 13.6.2010: Schematic rev. 1.5. With new PI, PPIMV and subsonic filter before poweramp. UPDATE 21.3.2010: New schematic uploaded. UPDATE 15.3.2010: Now the amp is pentode connected with NFB to PI. Preamp tubes changed to 12ax7 for more gain. Schematic soon. New Mid controll also coming up. Sound Big and clean Old info: The amp has really low gain and huge headroom. I tried to push the input stage to distort with a booster but 10Vpp signal was not enough for that... The tone control works good at least with a guitar. Nice "Tilt" control with some mid scoop adjustment. Tone control is a version of the Big Muff PI tone. It works nice but I would like a better control for the mid frequencies and may change this in the future. Seems to work great with distortion pedals. Problems Due to the 57% UL taps I only got approx 20W of clean output. I was hoping to get over 30W clean and near 40W full distortion. This is a setback. Now I need to add second pair of tubes or change to pentode circuit. That sucks because with pentode I have to use feedback and post PI master volume is not optimal with it. UPDATE 13.6.2010: I have now changed the amp to fixed bias with NFB and PPIMV and it seems to work better than expected. About 60W at full clipping. Maybe more. Definitely more if a 4 ohm cab is plugged to the 8 ohm output. Pekka |
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