Offering free comprehensive basic electronics tutorials in amplifiers, antennas, ham radio, filters, oscillators, power supply, receivers, test equipment, transmitters, radio design and electronics design. Links to data sheets and electronics reference and text books.
Electronics Tutorials – Ian Purdie VK2TIP
Amateur Radio, Amplifiers, Antennas, Basic Electronics, Ham Radio, Oscillators, Test Equipment.
Starting out you need to cover simple electronics which encompasses the topics of ohms law, voltage, current, resistance, capacitance, inductance, reactance, impedance and Q. Further topics in these electronics tutorials are power supply basics as well as digital basics.
What are voltage controlled oscillators
A voltage controlled oscillator or as more commonly known, a vco, is an oscillator where the principal variable or tuning element is a varactor diode.
The new Ham Project Pages are VHF/HF Aerial Analyser, A 600MHz Frequency Counter. Then there is a an ESR Meter for Electrolytic Capacitors.
VK5JST Amateur Radio Ideas with Photos
With a two tone tester, a dummy load and an oscilloscope, a transmitter can be really put through its paces. Two tone testing consists of applying two clean non-harmonically related sine waves of approximately equal amplitude to the audio input of an SSB transmitter.
The sine waves are typically around 600 – 700Hz and 1800 – 2000Hz i.e. about 300Hz from either end of the audio pass band.
A Simple Two Tone Oscillator
This project was published in the September 2004 issue of the Australian magazine “Amateur Radio”.
Other Readworthy Pages
- Easy PCB’s Made With Kitchen Appliances
- How to Make a Q Meter
- Making a High Current 13.8 VOLT Supply For SSB Transceivers
- VK5MM’s excellent amateur radio homepage
- Transformer Construction Details
- Shortform Method of Designing Power Transformers
The photos at VK5JST Homepage are very educative and express the idea better than words. – delabs
Designing Bipolar Transistor Audio PreAmps, Designing JFET Transistor Audio PreAmps, Designing Op Amp IC Audio PreAmps, Switching Regulator Basics, Using Transistors As Switches.
RASON Projects Page – Amateur Radio
- 10 Amp, 13.8 Volt Power Supply
- 12 Volt Gel Cell Charger
- Thermal Fan Controller
- Transistor Audio Amplifiers
- 12 Volt Gel Cell Charger
- Switching Regulator Basics
A Potpourri of Audio Amplifiers By N1HFX
“I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design. Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first. I will address IC audio amplifiers in a future article.”
The Radio Amateur Society of Norwich
P.O. Box 329 – Norwich, Connecticut 06360
I am designing a circuit that implements an AM radio circuit that ultilises the IC Double mixer and Oscillator NE612. I was just wondering whether there is any standard symbol for this kind of IC.
mail from CM
There is no standard symbol for NE612, just a square box. You have to make a custom part in the CAD software or see if someone has done that. check these links on info of NE612 circuit and symbol….
GM47: Simple 30m Band QRP CW-Transceive
The Rx mixer is followed by a IF stage featuring an NE592. The mixer’s balanced output is directly connected to the amplifier’s differential input, minimizing component count at this point.
Direct Conversion Receiver using NE612 for HF Bands
The NE612 is an integrated circuit which contains a balanced mixer with its own on-board local oscillator and voltage regulator. The mixer can provide up to 18dB of gain at 45 Mhz, and the local oscillator will operate up to 200 Mhz.
HF Transceiver using NE612
I would be working on the Transverter first, as with this, I could try out the 9Mhz SSB Module that I already have. I would be building the Transverter for the 14 Mhz band depending on the values from my DC Receiver project using the NE612 IC
My Start as a Ham – Ralph’s Story – “I suppose my interest in things electrical began when at a very young age I poked a metal hairpin into an electrical outlet. To this day, I vividly remember the amazing flash and bang that resulted! Of course, I wanted to know why that happened. It was a few years more before I learned to read, and found out about electricity.”
Ham Shack of W5JGV – Ralph
Ananth Notes- Thank god you survived to tell the story, this was a Jolt of a start. Very few people survive this. I would like to add …
All Mains Inlet Sockets should be Shuttered, so that such a thing does not happen again to any child again. Another Law, No Mains Socket should be less that 5 feet above the ground level.
Then we should all move to a 24V home voltage standard, Read more at my Tech blog..
EMerge Alliance – Safe Low-voltage Power
Then ralph has many projects with educative information. A RF Ammeter the Easy Way. A 400 Watt 60 Hertz Power Inverter. These are interesting to study.
Experimental KW HV Switching Power Supply
The design of switching supplies is a bit more involved than traditional “big iron” transformer power supplies. When taken step-by-step, however, it is quite possible for an amateur to design and build a working high power switching power supply. This article describes a high power, high voltage switch mode power supply designed to operate a KW level RF power amplifier.
Home brew Litz Wire
The Litz wire was fashioned by taking two parallel strands of #18 AWG wire about 115 feet long and twisting them together in a clockwise direction with an electric drill until the twisted wires had about two turns per inch. The twisted wire was then cut into four equal length and laid side by side.
Besides classical functions and dB conversions, RadioCalc includes a converter of Power to field strength commonly used for EMC/EMS test-set-up. Also impedance can be represented as a function of reflection coefficient (somehow like an electronic Smith-chart). This and many other functions are obtained by clicking into the arrow of the “Conversion off” window.
Radiocalc – Convertisseur Radio Universel
Thanks to RadioCalc the different dB charts are obsolete by computing the ratios of Power (W) or Voltages (V) according to dB = 10*log(P2/P1) ou dB = 20*log(V2/V1).
Just for a trial : type 100/10 (or just 10) and push the dB button as the ‘W’ mode is chosen, the result will be 10 dB, then choose the ‘V’ mode by clicking in the V button (in the Quick dB window) push again dB, the result is now 20 dB.
From – Temcom – Consulting for test & measurement and electronics in France
(This was Earlier Radiocalc, i have now updated the link to the new site in France)
The vintage radio equipment from the R.L. Drake Company. Life before solid state devices,..vintage radio equipment from the Collins Radio Company. Featuring the “S” Line radio equipment from the 1960’s and 70’s era.
WB4HFN Amateur Radio Website
Antenna construction, digital communications, operating tips and practices to handling CATV interference
Amateur Radio And Resource Information
Heathkit Vintage Amateur Radio Equipment
One of the first all solid state radios produced by Heathkit Company in the mid 1970’s was the SB-104 Transceiver.