DIY BLOG

LIST OF DIY PROJECTS HERE ON MY PAGE

1. MY FIRST FLOORSTANDING SPEAKERS

2. DIY AQUARIUM

3. 100 MM F/13 REFRACTOR TELESCOPE

4.   2010 SOLAR ECLIPSE SHOTS

5.   DOBSONIAN MOUNT FOR SCHOOL

6.   2010 ANNULAR SOLAR ECLIPSE VIDEO

7.   FEVICOL ( POLYVINYL ACRYLATE ACETATE) AS VINYL LP CLEANER

8.   HELICAL FOCUSERS FOR TELESCOPE MAKING WORKSHOP

9.   TRANSMISSIONLINE SPEAKER PROJECT

10.   BASS REFLEX DESIGN SPEAKER CABINETS FOR MY FRIENDS

11.   NEW MODIFIED HELICAL FOCUSER FOR TELESCOPE

12. 8 INCH REFLECTOR TELESCOPE BUILT FOR COLLEGE

13. WOODEN CRADLE FOR DOBSONIAN TELESCOPE

14. VINYL RECORD STABILIZER FOR TURNTABLE

15. HARD DISC RACK

16. VENUS TRANSIT 2012

17. METAL ALT-AZIMUTH MOUNT FOR REFLECTOR TELESCOPE

18. REAR PROJECTION SOLAR TELESCOPE

19. 200 MM ALT-AZIMUTH REFLECTOR TELESCOPE

20. LM 3886 GAINCLONE AMPLIFIER PROJECT

21. CNC MOVING MAGNET PHONOSTAGE FOR MY RECORD PLAYER

22. DIY SUPPORT CRADLE RINGS FOR SAMYANG 135 LENS

DIY support rings for Samyang 135 lens

To eliminate tilt in my lens i came up with this idea as i couldn't find a suitable tripod collar for my Samyang lens. This is very robust and stable design for my ioptron sky guider. If the lens is not supported with a collar it will compress the flange in DSLR body and suffer from elongated stars in the image.

For regular daytime photography it probably wouldn't matter much but there are a few aberrations when using it in Astrophotography. Samyang 135 lens is so heavy that it causes the star images to distort at certain angles. This is the best way to support the lens so it does not have pressure on the optics.

Samyang 135mm lens doesn't come with a tripod ring, couldn't find a suitable aftermarket ring for it, so i decided to make my own. I used a 15mm Aluminum flats for rings, they are machined, milled and finally cut.

Here are the pictures……...

Finishing

Final Result

CNC MM phonostage

Finally i completed my CNC phono stage build for moving magnet type carts. I must thank my friends Sachin, Raghu, Omishra & Sreekanth for their great assistance in building this beautifully sounding phonostage.This is inexpensive to build, Phonostage has two DIP switches for adjusting load impedance and set capacitance at 18k,33k,47k and 62 k. Performance is better than most of the budget phono preamps.The CNC is running on specially designed power supply unit designed by Omishra.
I am using LME49990 op amp, cartridge loading resistance is 62K. In comparison to Technics, Pioneer,Yamaha & Sansui, i find CNC "is more everything" bass is adequate, vocals are bit more forward and top end is sweet and musical after 40 hours of burn in. Background is dead silent, no hum or hiss without the record playing.

The face plate has been cut out from an Aluminum rectangular tube, i wanted no screws visible on the front panel. I really enjoyed making this unique cabinet as its a combination of aluminum & wood chassis.. Working with the thin front & back aluminum panel was very difficult particularly the edges, but well worth the effort.

This is indeed a amazing sounding phonostage. Sreekanth did excellent job on wiring.

Honestly, a huge applause to beloved friends Sachin and Raghu,

Project links:

Batery powered CNC phono stage at Hifivision.com

Another Super High End Phono Stage! No expense spared at Audiokarma.org

Here are some building pictures

LM 3886 chip amplifier project

After several weeks of planning and acquiring components &amp amp parts,i finally got down to constructing a chip amp (gain clone) 50 RMS in to 8 ohms.. The amp uses the National Semiconductor LM3886 chip with printed circuit boards purchased locally. This is a simple chassis using 4 aluminum panels on top , back, bottom and 2 heat sinks on the sides. Front panel is 6mm thick. Amp was completed few months back, helped by my friend Sreekanth, without him i would not have completed this project. It has done about 80 + hours of burnt in, it sounds pretty good, will be upgraded with few more power capacitors for better low's after some time.