Difference between pages "WA3TFS SDR Upverter Design" and "AudioAmp380"

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[[file:WA3TFS_Upverter-720px.jpg]]
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[[FILE:AudioAmp380-3D.png]]
  
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== Features ==
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== Design ==
  
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SDR up-converter/receiver shifts low frequencies up by 100 MHz. Used to listen to HF frequencies on an inexpensive RTL-SDR module.
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* Pre-amp plus power amp
 +
* 50 Ohm input impedance
 +
* External mount gain potentiometer
 +
** Gain potentiometer on preamp
 +
* [https://www.ti.com/lit/ds/symlink/lm380.pdf LM380] 2.5W Audio Power Amplifier
 +
** Wide Supply Voltage Range: 10V-22V
 +
** Low Quiescent Power Drain: 0.13W (VS= 18V)
 +
** Voltage Gain Fixed at 50 (34 dB)
 +
** High Peak Current Capability: 1.3A
 +
** Input Referenced to GND
 +
** High Input Impedance: 150kΩ
 +
** Low Distortion
 +
** Quiescent Output Voltage is at One-Half of the Supply Voltage
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* [https://www.ti.com/lit/ds/symlink/ne5534.pdf NE5534] Pre-amplifier
 +
** Low-Noise Operational Amplifiers
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** Equivalent Input Noise Voltage 3.5 nV/√Hz Typ
 +
** Unity-Gain Bandwidth 10 MHz Typ
 +
** Common-Mode Rejection Ratio 100 dB Typ
 +
** Wide Supply-Voltage Range ±3 V to ±20 V
 +
** Used as single supply
 +
* Fits into 80x50x20mm extruded aluminum enclosure
 +
`
  
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* $55 at W3PIE hamfest
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== Rev 2 Schematic ==
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* SBL-1 mixer
 
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* 100 MHz can oscillator
 
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* Low pass filter
 
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* [https://044640f.netsolhost.com/ 1 kHz to 1.7 GHz SDR Receiver] - WA3TFS Design
 
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** [https://rest.edit.site/filestorage-api-service/23f1203e3bd4a6128459f208dcf16362/forkiin-sdr-qst-article.pdf?dl=1 QST Article]
 
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** [https://static-cdn.edit.site/users-files/73eecae7c71adfad0f97a69e16be7203/sdr-wiring-diagram(3).pdf?dl=1 SDR wiring diagram]
 
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** [https://static-cdn.edit.site/users-files/e5b0fbd1d917fc766cf2197693d69209/bill-of-material-sdr-rev-1-3.pdf?dl=1 Parts List]
 
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** [https://static-cdn.edit.site/users-files/21f2eeabc8074f4bc64a7b350b8b52e1/pcb_r11.jpg?dl=1 Layout]
 
  
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=== Schematic ===
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[[file:AudioAmp380-Schematic.png]]
  
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[[file:WA3TFS_Upverter_Schematic.PNG]]
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== Rev 1 Rework ==
  
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== Software ==
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* Issues
 +
** Front end opamp has + and - reversed
 +
** Also hooked up the feedback to the wrong input
 +
* 5 Cuts
 +
** 4 on front
 +
** 1 on back
 +
* 5 Jumpers on back
  
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* [https://www.rtl-sdr.com/ RTL-SDR]
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[[file:U2-2_3_Rev1_Rev2_Cuts_Jumpers.png]]
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* [http://hdsdr.de/ HDSDR] - Easier to use
 
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* [https://airspy.com/download/ SDR Sharp] - Crashier
 
  
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== Build ==
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== Videos ==
  
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* Nice silver mica caps
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[[file:ZL2CTM_Schematic.PNG]]
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** My kit was missing the center cap of the band filter (150 pF)
 
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* Real [https://www.minicircuits.com/pdfs/SBL-1+.pdf SBL-1 mixer]
 
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* Cap installed in J_A to J_B marked 300
 
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* Build was tough due to very small pads on the PCB
 
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** Particularly tough to solder ground pads
 
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** Pad shapes were not round so less area to set soldering iron
 
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* Pin 1 orientations on the mixer and oscillator "backwards" from other board legends
 
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** Pin 1 shown in red
 
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[[file:WA3TFS_Upverter_pcb_r11.jpg]]
 
  
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=== Wiring ===
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<video type="youtube">GlT0HbvcmrM</video>
  
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[[file:WA3TFS_Upverter_Wiring.PNG]]
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== Assembly Sheet ==
  
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== Enclosure ==
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[[LM380 Rev 1 Assembly Sheet]]
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* Board fits perfectly in
 
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** [https://www.adafruit.com/product/2230 Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm]
 
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** Card just perfectly matches
 
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[[file:Adafruit_2230-00.jpg]]
 
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[[file:2230-03.jpg]]
 
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== Videos by others ==
 
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<video type="youtube">XeQnDpzhcRo</video>
 

Revision as of 14:10, 15 October 2021

AudioAmp380-3D.png

Design

  • Pre-amp plus power amp
  • 50 Ohm input impedance
  • External mount gain potentiometer
    • Gain potentiometer on preamp
  • LM380 2.5W Audio Power Amplifier
    • Wide Supply Voltage Range: 10V-22V
    • Low Quiescent Power Drain: 0.13W (VS= 18V)
    • Voltage Gain Fixed at 50 (34 dB)
    • High Peak Current Capability: 1.3A
    • Input Referenced to GND
    • High Input Impedance: 150kΩ
    • Low Distortion
    • Quiescent Output Voltage is at One-Half of the Supply Voltage
  • NE5534 Pre-amplifier
    • Low-Noise Operational Amplifiers
    • Equivalent Input Noise Voltage 3.5 nV/√Hz Typ
    • Unity-Gain Bandwidth 10 MHz Typ
    • Common-Mode Rejection Ratio 100 dB Typ
    • Wide Supply-Voltage Range ±3 V to ±20 V
    • Used as single supply
  • Fits into 80x50x20mm extruded aluminum enclosure

`

Rev 2 Schematic

AudioAmp380-Schematic.png

Rev 1 Rework

  • Issues
    • Front end opamp has + and - reversed
    • Also hooked up the feedback to the wrong input
  • 5 Cuts
    • 4 on front
    • 1 on back
  • 5 Jumpers on back

U2-2 3 Rev1 Rev2 Cuts Jumpers.png

Videos

ZL2CTM Schematic.PNG

Assembly Sheet

LM380 Rev 1 Assembly Sheet

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