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‘Retro-40’ Instructions                                        July 11, 2011 

Page 1 

 

 

‘Retro-40’ AM Transceiver  

Board Kit Instructions 

               

 

For illustrative purposes only- do not use as a reference. 

 
 

 

 

            

Thanks  for purchasing a Small Wonder Labs "Retro-40" transceiver kit!  

 

    Please take a few moments to look over the sections entitled "

First Things First

" before  

you dive in. This section contains information which is key to your success with this kit.  

 

 

 

TABLE OF CONTENTS: 

 

Tools/Basic Info  

 

 2,3 

Component Identification 

    4 

Retro -40 Description 

  

 5,6 

 

Parts List  

  

 

7, 8 

 

Schematics  

  

 

9-10 

Pictorial Drawing 

  

   11 

Building instructions  

 

   12              

 

 

  

     

Wiring Up the ‘Retro-40’  

   14 

Alignment 

 

           15-16 

 

Troubleshooting  the "Retro-40 " [under construction]

  

 

Summary of Contents for Retro-40

Page 1: ...e a few moments to look over the sections entitled First Things First before you dive in This section contains information which is key to your success with this kit TABLE OF CONTENTS Tools Basic Info...

Page 2: ...dio Shack s Color Code Guide 271 1210 or the ARRL Handbook will help If you re not sure verify the resistor values with a multimeter before installing For what it s worth roughly 8 of the male populat...

Page 3: ...ut singly to minimize the risk of lifting pads Contact me for replacement parts if necessary After removing a component from the board the through hole will probably still be blocked with solder Use a...

Page 4: ...the capacitor NPO Disk Caps NPO disk caps may be distinguished from other types of disk caps they have a black band at the tip of the ceramic disk Extra information on components There s often extran...

Page 5: ...by SSB stations out of the detector stage In light of the BC 611 s lack of selectivity this was largely a case of reinventing the wheel Rather than wrestle with more stages of filtering or the use of...

Page 6: ...ex inverters for instance with all gates connected in parallel for higher drive current capability The choice of a microphone can often be problematic I d initially planned on using an HT speaker mic...

Page 7: ...rolytic 25V 220 uF 1 C30 470 uF electrolytic 470 uF 10v 10 D1 D4 D6 D9 D11 D12 1N4148 diode glass body 1 D5 MV1662 varicap diode 2 leads banded 1 D10 LED red plastic 2 leads 1 D13 1N5818 rectifier dio...

Page 8: ...T2 IF transformer metal can 42IF123 1 T3 Audio transformer TU048 R 1 U1 SA612AN IC 2 U2 U7 78L06 6V voltage regulator IC 1 U3 LM386 IC 1 U4 12C508A IC preprogrammed 1 U5 LM1458 MC1458 IC 1 U6 TDA2003V...

Page 9: ...01 1 5K V T2 4 7K 22 01 5 185 Mhz 47 47 10 uH L2 Q1 Q2 Q3 100 pF 50K Vr 1M RX TUNE GAIN D1 D2 100 C3 1M 100K 1K 10 uF D3 D4 U2 78L06 V 01 01 1K 01 100K 22 pF 100K 1 5K Vr 1 8 5 TP1 TEST C D CLK IN Vs...

Page 10: ...18 C107 C108 C109 C26 C24 T3 L3 L4 L5 L6 C37 C38 C116 C39 C40 C41 1 uF 100K 4 1 100 uF V 1 5 U6 100K 1 uF R20 C110 C111 Q9 B 2 1 uF 1 220 2 2 470 uF 47 1 4 7K 10K 3 1 uF 100 100K 1K Y4 Y5 47K 47K 1 10...

Page 11: ...107 100 uF D12 D11 C108 1 015 uF 01 C25 R19 10K C109 C24 1 10K R18 MIC 033 uF C16 C15 C14 001 01 01 01 C113 114 Y4 Y5 R29 30 2 2K 2 2K R14 1K R13 100K 01 C23 100K R16 1 5K R15 D9 D10 R27 3 3K C28 1 uF...

Page 12: ...ions we incorporate corrections and new material to make the experience more enjoyable for everyone All parts installed on the PC board should be fully seated unless otherwise noted Static sensitive C...

Page 13: ...ts on the board bend the protruding leads slightly outward to keep them in place while the board is inverted for soldering Mount all components on the silkscreened side of the board Solder components...

Page 14: ...e Microphone 2 27 2010 Note Wire colors are non critical Colors shown for illustration purposes only Note Do not bundle these wires with other control functions Frequency selection The inset in the il...

Page 15: ...This should change the indicated value of DC voltage from the step above Use a fingertip to push the capacitor over slightly to ensure good contact with the board pads Select the value of C3 A which...

Page 16: ...close talk the microphone at approximately from your mouth If you re hitting the audio hard enough LED D10 will just flicker faintly on voice envelope peaks Note this is not what you d call a good mic...

Page 17: ...or This cuts the audio level to the modulator by a factor of 10 20 dB and reduces the resulting distortion Ceramic Microphones The ceramic piezoelectric microphones provide high level audio but requir...

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