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Old 1st November 2010, 05:11 PM   #1611
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hello sir

1st one is apex quasi amplifier 550w ..

and 2nd is also from apex b500...
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Old 2nd November 2010, 08:47 AM   #1612
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Default Shekerez Headphone amp

This is my headphone amplifier. It is dead quiet and has an ashtonishing dynamics. It can drive my Grado as well as my Senhyser headphones.
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Old 6th November 2010, 08:46 AM   #1613
fotios is offline fotios  Greece
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Default The ultimate control unit!

Behold a useful "tool" for each DIYer who takes his hobby seriously! A different control unit for preamplifiers and integrated amplifiers!

Here is the full article: welcome to* The Electronic Audio Labs web magazine
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Old 7th November 2010, 06:40 AM   #1614
fotios is offline fotios  Greece
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Default Few pictures more, and a small description

What it makes this control unit to differ from others, is not the common RC5 remote control receiver/decoder that includes, but:
1) its ability to manage noiseless Latching Relays which can be used as input selectors, like in famous Hi-End preamplifiers (e.g. Pass Labs X.01).
You could consider Latching Relays like an expensive rotary switch.
2) its ability to control the ALPS RK27 Blue Velvet volume potentiometer digitally, either thru the remote control handset or thru the 2 push-button switches mounted on the control board, while, at the same time it shows the volume value (depending on the rotation angle of ALPS) on the LCD display thru the second mono potentiometer (connected at the Analog input RA0 of MCU) that is joined to the shaft of ALPS. Therefore, no need for bulky volume knobs, holes, print of circular numerical scales on front panel etc. The volume control unit can be hidden inside the case of preamplifier.
You can read many other details and instructions, and you can download schematics and PCB layouts ready for direct printing on artwork films from: http://www.eal.gr/MICROS.htm
Sorry guys, but the article is too long, and i wouldn't like to spend precious space from the diyAudio forum servers.

Fotios
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Last edited by fotios; 7th November 2010 at 06:48 AM.
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Old 7th November 2010, 07:16 AM   #1615
Gyuri is offline Gyuri  Hungary
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I congratulate you, dear my friend!

Gyuri
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Old 7th November 2010, 11:16 AM   #1616
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mmm I kinda like it Fotios, maybe I will pair it with a Lighter note as a way of adding LDRs a remote control and the ability to see the percentage of volume.
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Old 7th November 2010, 11:27 AM   #1617
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by regiregi22 View Post
I will pair it with a Lighter note as a way of adding LDRs a remote control and the ability to see the percentage of volume.
Yes, the motorised pot can be used to control the current to the LEDs.
But the pot circuit must allow all 6 pins to be intercepted for the LED current control signals.
If the pot is soldered in with a common ground for both return pins, then you will need to modify the PCB slightly.
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Old 7th November 2010, 08:35 PM   #1618
fotios is offline fotios  Greece
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Quote:
Originally Posted by regiregi22 View Post
mmm I kinda like it Fotios, maybe I will pair it with a Lighter note as a way of adding LDRs a remote control and the ability to see the percentage of volume.
You should be able to use the ALPS motorized pot. for the brightness control of LEDs needed for the LDRs, instead for the signal level control. Taking into account the LED Vf=2V (3V for high brightness LEDs) i am wondering: where you can find a linear motorized pot. of 2 X 500 Ohms? Be it so 2 X 1K? The smallest value offered on the market is 2 X 10K.

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Old 8th November 2010, 07:38 AM   #1619
Bonsai is offline Bonsai  Taiwan
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Very nice Fotios! I like the way you used a second pot to read the position of the main ALPS pot - very neat. Boards look good too.
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Old 8th November 2010, 10:36 AM   #1620
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Quote:
Originally Posted by AndrewT View Post
Yes, the motorised pot can be used to control the current to the LEDs.
But the pot circuit must allow all 6 pins to be intercepted for the LED current control signals.
If the pot is soldered in with a common ground for both return pins, then you will need to modify the PCB slightly.
I have just realized that we would need to have the same 100k log dual pot, but I have just seen too that it has already a 100k alps.
For the pinout I am aware that we may have to isolate all 6 pads and cut the necessary traces, for optimal isolation.

Fotios, the pot is not intended to work directly with the LDR, but with the boards Uriah is offering for the simpler LDR vol. control or for the Lighter note. They need a 100k pot, so adding this external one should do the job.
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