Wants to build your own FM radio station and broadcast music over your house? It will be easy with our educational diy kit of voltage controlled oscillator (VCO). The transmitter can be tuned to desired frequency with multi-turn variable resistor or with external PLL.
The circuit of the kit contain J-Fet 310 based VCO and Buffer Stage. It do not include RF amplifier stages because is illegal to broadcast with RF Power more than several milli-watts. The project was developed ONLY for education purpose and you have to understand it clearly. Even it has compatibility with PLL, it still stay amateur DIY device and does not fit into full technical standards of the legal FM Broadcasting.
Technical Specifications:
Frequency: 97-102 MHz
Range: Up to 25 meters
Modulation: Wide Band FM
PCB: 40x35mm
PLL compatible
PC Line Out Level compatible
Supply Voltage: 8-12V DC
Supply Current: 12.5mA at 12V
The transmitter require a regular FM 88-108MHz receiver. You can broadcast a mono audio signal or MPX stereo.
Kit package include PDF user manual with assembling process photos and calibration instruction.
PCB size is 4.00 x 3.50 cm, double layer with green soldermask and ground plane.
The PCB has reserved place for 78LXX voltage regulator, but the IC is not included in the purchase. You can use it in case your power supply is noisy. R10 potentiometer should be installed for manual frequency tuning, but if you're going to use PLL please do not solder it.
For stable transmitting range and reducing hum we advise you to use dipole antenna. Dipole design and transmitter enclosure draft can be found in our PDF manual.
Tuning process is easy but require patience because VHF device is very sensitive. If you use R10 manual tuning then even your hand over the PCB can influence the frequency. Please see two our demonstration videos with tuning.
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Demonstration of the my homemade prototype for radiation detector kit. The board can drive STS-5, SBM-20 or SI3BG tubes. Led and sound indication is presented.Please follow store updates when the manufactured kit will be available for sell.
Finally I found some time to install my XR2206 Function Generator Kit in plastic enclosure, so I want to share some photos of the project. The kit of XR2206 you already have seen, but if somebody interested again please follow:
For project box I have chosen my small black enclosure "Plastic Project Box" Made of ABS, really easy to drill material. With internal dimensions of L x W x H 95 x 84 x 59 mm. Has removable front and back panel.
Here is the finished project before I close the cover. I used Rotary Switch limited to 4 position. Actually you can adjust the switch to 12 position, but in this project I only need 4 position for selecting timing capacitors. The front panel has also Sine/Triangle switch and 3 rotary potentiometers for controlling amplitude and frequency (coarse and fine adjust).
The back panel has 2 BNC Female Panel sockets for frequency output. One for square wave and one for sine/triangle wave. Power jack is 2.1mm standard jack that feet any AC/DC adapter. I also added one 470uF 50V filter capacitor for possible "noisy" power supply and indication 3mm diode with 4.7K resistor.That's all!
Nice and simple project that I can use in my home lab. Now I need find a way to do some trig stickers labels for function knobs.
Prototype of the new revision of High Resolution Cap Meter
New revision is on the way to manufacturing soon. There is the prototype of High Resolution Cap Meter by Roman Black. Second edition of the DIY Kit has several improvements thanks to suggestions of our customers.
So, whats is new?
On/Off Power button
Led indication of the supply voltage
Trimmer for manual calibration
Detachable LCD display
In addition, there is new compact design of the pcb. Dimensions of the board now is 81x47 mm. The previous version has 85x55 mm pcb. When the new revision will be available for sell, I'll inform about it on the main page of the store. Hope you'll like it!
New Delivery Method for Israeli Customers - "Priority Mail 24"
Now all small volume orders with total weight up to 100 gram will be sent with Priority Mail 24. This service of Israel Post allow next business day delivery for really low price. The service available only for Israel residents. Tracking information for "Mail 24" unfortunately is not supported, but the new method will safe your time and money, especially when you need to order just several components and do not want to overpay for the delivery. We hope you'll enjoy it.
Take note, allowed package for Priority Mail 24 is envelope only.
All orders with total weight more than 100 gram or with volume bigger than envelope is still will be sent with Registered Mail with tracking, like it was before.
