circuit

circuit

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• The 4X4 Slimtenna - Development of the Slim Jim antenna for HF
  [ Hits: 1382 | Votes: 0 | Rating: 0 ]

• Variacs - Variable Autotransformer - Use these Variac auto transformers for specific application requirements that include, but are not limited to, home coffee roasting, tube amps, and more.
  [ Hits: 337 | Votes: 0 | Rating: 0 ]

• SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers
  [ Hits: 912 | Votes: 1 | Rating: 10 ]

• idealCircuit - IdealCircuit is an analog circuit simulator working with true ideal components. It uses exactly the same unique and robust algorithm as NL5 Circuit Simulator. Simple and intuitive interface, fewer components and models, no fancy and powerful features that are only useful for specialized applications.
  [ Hits: 465 | Votes: 0 | Rating: 0 ]

• Integrated Circuit Audio Amplifiers - Circuit designs for IC audio amplifiers by N1HFX
  [ Hits: 421 | Votes: 0 | Rating: 0 ]
• Design Guidelines for JFET Audio Preamplifier Circuits - Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX
  [ Hits: 645 | Votes: 4 | Rating: 1 ]

• Adjustable Regulated Battery Charger - This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.
  [ Hits: 350 | Votes: 0 | Rating: 0 ]
• A NiCAD Battery Charger - A NiCAD Battery Charger with Current and Voltage Limiting
  [ Hits: 476 | Votes: 0 | Rating: 0 ]

• RF Dummy Load - The use of dummy load is mandatory for off-air adjustment of the transmitters. Build one.
  [ Hits: 843 | Votes: 2 | Rating: 9 ]

• Noise Bridge Tuner Tuner - Noise bridge circuit to tune your tuner
  [ Hits: 372 | Votes: 1 | Rating: 10 ]
• About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
  [ Hits: 470 | Votes: 3 | Rating: 5.33 ]

• RF Sampler - This circuit will let you look at the signal and frequency output of your transceiver.
  [ Hits: 720 | Votes: 1 | Rating: 10 ]

• QLF Filter - Microprocessor based interface designed receives a signal from a Morse key, processes it, and re-transmits it to the radio. A microprocessor in the circuit is pre-programmed with a proprietary algorithm which makes a number of measurements and adjustments to the less percise human generated code.
  [ Hits: 373 | Votes: 0 | Rating: 0 ]
• A low cost morse Trainer / Keyer - By Prof. T. K. Mani - VU2ITI
  [ Hits: 1171 | Votes: 1 | Rating: 10 ]

• 144 MHz Very Low Noise Preamplifier - An home made low noise preamplifier project for 144 MHz, with detailed circuit diagram. The VLNA-144 preamplifier has been Published on DUBUS 4 2019
  [ Hits: 423 | Votes: 2 | Rating: 10 ]

• Circuit Improvements for the TS-440S - Some improvements for the Kenwood TS-440S, including distortion level in SSB in transmitted signals, Lack of crispness in the RX audio and Limited transmit frequency coverage.
  [ Hits: 621 | Votes: 2 | Rating: 5 ]

• 30 m Band Direct Conversion Receiver - The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.
  [ Hits: 769 | Votes: 1 | Rating: 4 ]

• Grip Dip Oscillator - Originally eveloped by I1FLC, uses seven plug in coils covering 3.0 to 30Mhz in a Colpitts oscillator circuit.
  [ Hits: 667 | Votes: 1 | Rating: 10 ]

• Build a Test Meter - This article include a circuit that allows a cheap 0-1mA meter to be used as a micro-ammeter or a milli-voltmeter
  [ Hits: 257 | Votes: 0 | Rating: 0 ]

• Vacuum Tubes - Vacuum Tubes History, Theory, and Circuits
  [ Hits: 490 | Votes: 2 | Rating: 4.5 ]

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