4X Dragon Audio Budgie Pre-Amp build

arduino based linestage using 12B4 tubes

4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:25 pm

Going to start building the over the top version of the Budgie Pre-Amplifier this week. Rather than clutter up the "first post" I will start my own.

This version has a few addition's.

One, a RIAA stage....tubes and vinyl just go together. The RIAA stage is a Bugle 2 from Hagerman Technology ( http://www.hagtech.com/bugle2.html )
Two, Switched AC out via a relay and modification to the original Arduino code Shannon provided.

Shannon Parks wrote:
IceFyre13th wrote:I see there are unused digital pins on the Nano (D0, D1, D2), my thought would be to use one pin to drive a transistor (2n2222 NPN) that would drive the relay coil with a delay. This would allow the preamp to be fully on before turning on the amp (eliminate thumps).


D0 and D1 are part of the serial communications via USB, so leave those alone. The two available pins are D2 (which can be interrupt driven) and A7 (which can be used as an analog or digital pin).

The whole void setup has been offloaded to "setup.h". In setup.h, you'll see:
Code: Select all
//set up the LCD, splash screens and tube delay
  Setup_LCD();


This is the LCD already doing a 15 second countdown to warm up the 12B4s. They'd screech something awful otherwise. You could just put your code there:
Code: Select all
//set up the LCD, splash screens and tube delay
  Setup_LCD();

//Energize 120VAC Relay added by IceFyre13th 1-23-2014
pinMode(transistorBasePin, OUTPUT);
digitalWrite(transistorBasePin, HIGH);


You'd declare at the top of mem.h:
Code: Select all
// Digital pin assignment notes
// Analog pins used as digital are considered D14 thru D18 (e.g. A0 is D14)
//
// D0 and D1 are reserved for serial bus (TX & RX)
// D13 can only used as an output as there's a status LED is on that port
// SPI bus is not used other than for digital pins (no MOSI, MISO or SCK)
// D2 is the only spare pin, but it supports hardware interrupts and PWM
const byte transistorBasePin = 2;  //added by IceFyre13th 1-23-2014
const byte CLK_595 = 3;
const byte LATCH_595 = 4;
const byte ENABLE_595 = 5;
const byte POWER_LED = 6;


So pretty easy stuff. The tricky part is sourcing an adequate relay as power amps can be current hogs. And the power down scheme might need to be more elegant.

Shannon


The relay I am using is a Omron G2R-2-SND-DC24(S), from Mouser ( http://www.mouser.com/ProductDetail/Omr ... 2qZA3ZjMH6 ) with the panel mount socket, Omron P2R-08A, also from Mouser ( http://www.mouser.com/ProductDetail/Omr ... 252bhGA%3d )

Power Supply, I have a few of these at home, http://ecatalog.astrodyne.com/usa/open- ... /OFM60-240 , So I am using one.....they are on e-bay ( http://www.ebay.com/itm/ASTRODYNE-Open- ... 1380961992 ) and other places.

All of the above will be in a Hammond Chassis, HWCHAS1710BK......also at Mouser ( http://www.mouser.com/ProductDetail/Ham ... SKaA%3d%3d )

As my day job is as a "Mechanical Engineer" and I work with SolidWorks I modeled the assembly as seen in the attached pictures.

The top, front and rear panel were also made into Front Panel Express files. You should note, my push button switches are no longer available anywhere..they are weather proof momentary type used for industrial machinery....so if you want to duplicate this build you would need to change the switch holes for the type of switches you have.
Attachments
4X Dragon Pre-Amplifier Assembly 1.JPG
4X Dragon Pre-Amplifier Assembly 1.JPG (202.22 KiB) Viewed 3829 times
4X Dragon Pre-Amplifier Assembly 2.JPG
4X Dragon Pre-Amplifier Assembly 2.JPG (248.26 KiB) Viewed 3829 times
4X Dragon Pre-Amplifier Assembly 3.JPG
4X Dragon Pre-Amplifier Assembly 3.JPG (280.81 KiB) Viewed 3829 times
IceFyre13th
 
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:35 pm

Reserved for Power supply and AC relay connections
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:36 pm

Reserved for RIAA preamp
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:36 pm

Reserved for Budgie
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:37 pm

Reserved for Chassis modifications
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:38 pm

Reserved for Front and Rear Panel wiring
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:38 pm

Reserved for Final assembly
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:39 pm

Reserved for Testing and setup, Arduino code as well
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Re: 4X Dragon Audio Budgie Pre-Amp build

Postby IceFyre13th » Mon Mar 03, 2014 1:39 pm

Reserved for End Results
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