Webmaster's Page



I enter the QRPHB/SWL HomeBuilder site via this page. It has some often used resources for designing and analyzing circuits plus sourcing and ordering parts. Although most of the parts links are from Digi-Key, basic information about the part is provided by Digi-Key and can be extrapolated for searching other parts suppliers or cross referencing.

This is really not intended to be a major public page for the QRPHB/SWL web site as it contains my personal links and perhaps is a little self-indulgent.

    


My electronic work bench cats page. If you have a cat who helps out on your work bench, please send me a photo.

RF Transistor Data Spreadsheets

  1. FET
  2. BJT

Parts

  1. W8DIZ Toroid Page   Diz is the Toroid King - Kits and Parts is one stop shopping for many RF parts
  1. Transistors
  2. IFR510 from Digi-Key
  3. J310 from Digi-Key
  4. 2N3904 from Digi-Key
  5. 2N3906
  6. RF Capacitors
    1000 pF RF cap with C0G TC Good for bypass in VFOs where temperature is critical
  7. Multi-layer, monolithic ceramic capacitors from Digi-Key. These are the main RF caps I use  I use C0G TC whenever possible
  8. Smaller value C0G ceramic caps; 10 pF and less. Good for linking double tuned circuits and VFO tanks
  9. RF Trimmer caps
  10. 6.0-50 pF Murata  I use these for tuning double tuned band pass filters
  11. Miscellaneous
  12. Mini pots for experimenters  Drop right into an Ugly Constructed board; not cheap, but reusable!
  13. TO-92 package 5 volt (pos) regulators - 100 mA
  14. 2N7000 MOSFET switch in a TO-92 package
  15. LM555  Cheap 555 timer
  16. Crystals
  17. 3.579545MHz Crystal for 60 Hz time base  ±30ppm, 18pF load C
  18. 32.768 kHz time base crystal ±20ppm 12.5pF LC
  19. Crystal for the EMFRD Frequency Counter- 3.2768 MHz
  20. Mouser
  21. Digi-Key  They actually do not have the 3.2768 MHz crystal, but have a 3.276 MHz crystal by ECS with the same specs
  1. 4000 Series Logic
  2. MC14070B Quad Exclusive OR Gate   Datasheet
  3. CD4013B Dual D Flip-Flop
  4. CD4049UB  CMOS Hex buffer/inverter  Datasheet
  5. HEF4093BP  NAND Gate - Schmitt Trigger  Datasheet
  6. 4027 Dual JK Flip Flop
  7. CD4001  QUAD 2-INPUT NOR GATE
  8. CD4017BE CMOS decade counter
  9. 4518 BCD up counter Dual 16 pin
  10. CD4511 7 segment LED driver/decoder
  11. CD4046B  PLL
  12. CD4543 7 segment LED driver/decoder
  13. 4028 IC decoder BCD-DEC
  14. 4011 Quad NAND gate
  15. 4023  Triple NAND gate
  16. CD4021BE  shift register
  17. MC14553BCPG BCD 3 digit counter 16 pins
  18. 4060 14-bit binary counter
  19. 4021 8-bit shift register
  20. 74HC Series Logic
  21. 74HC86N  IC GATE EXCLUSIVE OR QUAD 14-DIP
  22. MM74HC74AN  D Flip-flop   Datasheet
  23. 74HC73N  JK Flip-flop
  24. M74HC390B1R  DECADE COUNTER DUAL 16-DIP
  25. 74HC4060N   COUNTER 14-STAGE BIN OSC 16-DIP
  26. 74HC138  IC DECODER 3-8 LINE EXP 16-DIP
  27. TC74AC00PF  IC GATE NAND QUAD 2INP 14-DIP
  28. 74HC14N  Inverter with Schmitt Trigger
  1. Popcorn CMOS Analog Switches
  2. I consider the 4052, 4053 and 4066 "popcorn quality" mixers because they are slower and have a higher ON-resistance (say 100 ohms or so) than the high speed bus switches used in high-end rigs like the K3 and Triad receivers. Even a lowly silicon diode will have just a few ohms ON-resistance when conducting. The following 74HC/4000 series ICs are DIP - okay  for some  popcorn receivers.
  3. 74HC4053  Datasheet for 4053
  4. 74HC4052N  Datasheet for 4052
  5. MAX4066CPD+-ND   Datasheet for 4066CPD+   Application note
  6. Leaded bus switches are apparently no longer made. If you can find some cheap, consider buying them. Pericom
  1. 7 Segment Digits
  2. 3 digit common anode    Datasheet
  3. 4 digit common cathode
  4. 1 digit common anode
  5. 1 digit common cathode - get common cathode if you are driving a 7-segment digit with a 4511
  1. SMT Parts
  2. SOIC prototyping boards called "Surfboards"
  3. 8 pin  search their site for more
  4. 16 pin
  5. SMT FET Bus Switches for Mixers  Low on-resistance
  6. CBT3306  Dual FET bus switch SOIC  Datasheet
  7. CBT3125  Quad FET bus switch SOIC
  1. Op amps
  2. 5532
  3. LMC662  CMOS Dual op-amp ideal for operation from a single supply. Operates from +5V to +15V and features rail-to-rail output swing. Datasheet
  4. TDA7052  AF power amp IC.  A potential replacement for the LM386. There is also a SMT version . Datasheet
  1. AF caps for filtering and such
  2. Miniaturized Metalized Polyester Film Capacitors  search around these pages for different caps
  1. Diodes
  2. BAT46  DIODE SCHOTTKY SS 100V DO35

Online Tools

  1. Standard resistor and cap values
  2. Best inductive/capacitive reactance calculator on the web  Plus other great tools via menu
  3. resistive pad attenuator calculator   good app
  4. Simple Sallen-Key low pass filter calculator for op amps Plus countless other useful calculators under "Electronics"
  5. Good collection of datasheets from Jaycar

Webmaster's Links

  1. Radio
  2. Renaissance of DC Receivers - pdf
  3. PA3AKE's links
  4. European Radio Clubs
  5. Smith Chart information
  6. RF Coax cable data and specifications
  7. HAM Radio Forum
  8. EEV Blog - Dave's passion and knowledge is inspiring
  9. Anatek corporation Now this is where I want my family to buy gifts for me!
  10. Rod Elliot's ESP Site  Good audio content. Rod's articles on lamps are most interesting as well
  11. WSJT Home Page - Joe's, K1JT site This man is a giant in physics and radio electronics
  12.  
  13. High Performance Mixers
  14. Bus switches such as FST3125 or SPDT switches like the FSA3157 etc are surface mount and not popcorn parts. They are being used in incredible H-Mode mixers. Some favorite links follow for study purposes.
  16. Arnim Rudder, 9Y4AR
  17. Andy Talbot G4JNT
  18. Martein, PA3AKE
  1. Spectrum Analyzer
  2. W7ZOI/K7TAU part 1
  3. W7ZOI/K7TAU part 2
  1. Tube Guitar Amp
  2. Ceriatone tube amp kits
  3. Occasionally, I rebuild a blown solid state rectifier circuit for tube amp players. Here is the diode I currently use. Nice.