SI4732 SSB - AM - FM RADIO FROM TARSUS/TURKEYUSTAOGLU AUDIOhttps://github.com/pu2clr/SI4735/tree/master/examples/SI47XX_10_RDS/SI4735_04_RDS_ALL_IN_ONE_OLED?fbclid=IwAR2G_J3fVCNTBizoaJJYJuxyiEtiQIUBj75Kz8jfBohvTYgRKM9IBByXuBM

LC7265 FREQUENCY METER FROM TARSUS / TURKEYDESING BY TB5CVN

MOSFET FOR QRP TRANSCEIVER HF PA FROM TARSUS/TURKEYDESING BY USTAOGLU AUDIO

In this final version of my "Atari punk Console" we add a simple potentiometer to the CV pin on the second oscillator and a jumper to add it into the 1st oscillator as well. This gives us a very wide frequency range to create tones. in final assembly I used rolled pin headers in place of the timing capacitors to allow for different values. You can season to your own taste.

This is a PCB for a Eurorack Powersupply. If you want to design your own modules our test DIY modules, you can test your modules with out damaging your Main Eurorack Powersupply.

FORTY 1/B SSB HF QRP FROM TARSUS/TURKEY

QRP HOBBY RADIO, SSB RECEIVER, FROM TARSUS/TURKEY

Back in January, I did a workshop at CodeMash 2020 on soldering and programming an ESP32-based conference badge. It went very well, with near perfect success among the 50 or so participants. The hardware was simple to assemble, but somewhat limited in terms of peripheral capabilities – especially in regards to audio output.In the spirit of continuous improvement, I have prototyped the next generation of the badge, dubbed the “ESP32 R4ge Pro”. Enhancements include:CD-quality audioStereo speakers with volume controlMEMS microphoneA bigger and touch-sensitive screenFirmware-controlled screen dimmingTwin analog joysticksIntegrated battery chargingA number apps and games have already been created for the R4ge Pro in the GitHub repo, with more planned and in development. These include:Pong cloneDrum sequencerInternet radio playerWave recorder and FFT frequency analyzerFM SynthesizerBluetooth tank/robot remote controlGitHub repo documents folder also contains full schematic, bill of materials, and a simple case STL file.

RD15HVF1 15W FM RF AMPLIFIER PROJECT.

A Raspberry Pi expansion board containing a MIDI interface, DAC, and OLED display requiring only through-hole soldering skills. This is primarily intended as an all-in-one hardware solution for the mt32-pi Roland MT-32 emulator but all features are usable with Raspberry Pi OS, too.FeaturesTI PCM5102 I2S HiFi DAC (using the ubiquitous GY-PCM5102 carrier board)GPIO MIDI interface with in, out, and thru0.91" OLED displaylarge-ish 5V bypass capacitor which may help with slightly weak power suppliesworks with mt32-pi and Raspberry Pi OSno SMT soldering required, suitable for DIY electronics beginners and clumsy people ;)For more information, schematics and BOM, visit https://github.com/gmcn42/clumsyMIDI

To adjust, adjust and calibrate the scales of radio receivers and radio amateur measuring generators and to verify them during long-term operation, a signal source of a higher accuracy and stability class is needed. The proposed version of the quartz calibrator provides at the output a grid of modulated harmonics of the fundamental frequency of the used quartz resonator.One of the quartz resonators was taken at a frequency of 28 MHz., As a result, at the output of the calibrator I received frequencies of 28 MHz, 14 MHz, 7 MHz, 3.5 MHz, 1.75 MHz, which perfectly coincides with the beginning of 4 radio amateur bands and will allow not only tune the receiver to that frequency, but also tune the bandpass filters in the receiver. The 3rd harmonic of 7 MHz will give us another 21 MHz amateur band.The second quartz resonator was a 4 MHz resonator, which allows us to obtain "even" frequencies when dividing - 4 MHz, 2 MHz, 1 MHz, 500 kHz, 250 kHz. The harmonics of these fundamental signals should be enough to tidy up the scale of the receiver.

Hardsid ISA cloneThis is a reincarnation of the Hardsid clone which I made almost 20 years ago. The back story on that page is true, me and my colleague really had intention to make a PCI version which would be software compatible with the Hardsid ISA. We had working code for PCI interface implemented with Altera FPGA from another project. It didn't really support all the PCI features, but it realized a few I/O addresses for read and write operations. When the official Hardsid PCI was released, we kind of lost the interest, even though it would have been a fun project. I didn't receive any emails about the Hardsid clone schematics and layout files until the last two years. I have had a few requests if I still have the Gerber files available. Sure enough, I still had the Eagle design available. Instead of just providing the Gerbers, I have made some slight changes to the layout as well. My original design was nearly 100% clone of the original Hardsid ISA. But it was difficult to source the ISA bracket for that. I used one from ISA network card but it wasn't really a good fit. There are still ISA brackets commercially available, and I chose to use the Keystone 9202, which is available from several distributors. It was necessary to increase the board size a little, to accommodate the 9202 screw locations. I also swapped the EXT In and RCA out connector locations in order to make room for the second screw hole. These changes also make the board look different enough compared to original Harsid ISA, hopefully preventing anyone selling this clone as original. Below is Eagle3D / POV-Ray render of the 'new' clone board.And here are downloads for the Eagle design files, circuit diagram, assemby drawing and BOM. And here is Mouser shared project which contains all the components for the project (except the SID!)hardsid_isa.zip Eagle .sch and .brdhardsid_isa_circuit_diagram.pdf Circuit diagramhardsid_isa_assy_dwg.pdf Assembly drawinghardsid_isa_bom.xls Bill of materials, exported from the Mouser projectAbout component selectionAlthough the circuit diagram and assembly drawing indicate HC logic family, I have selected HCT family parts for the Mouser project BOM. This is because the ISA bus was originally specified for TTL, not CMOS logic levels. I have used HC chips in my build, and the board has been working flawlessly with several motherboards. They have all been quite late models from late 90's or early 2000, so maybe those have CMOS levels on the ISA bus also. I think the original Hardsid ISA used LS family, but I can't be sure because I didn't check the voltage levels. The markings on the chips were sanded off and painted black. LS chip availability seems to get worse nowadays, especially the 74LS574 is difficult to get now. So my recommendation is HCT, but the HC and LS should work as well. Just don't use a mix of HC and LS chips, it will cause problems!Note that I haven't ordered the complete Mouser project BOM myself, so I can't be sure that all components are correct. If you build this board with components from the Mouser shared project, let me know about the results!For more information, visit the project web page at http://kair.us/projects/hardsid_isa/index.html

The theremin (originally known as the ?therphone/etherphone, thereminophone or termenvox/thereminvox) is an electronic musical instrument controlled without physical contact by the thereminist (performer). It is named after its inventor, Leon Theremin, who patented the device in 1928.The instrument's controlling section usually consists of two metal antennas that sense the relative position of the thereminist's hands and control oscillators for frequency with one hand, and amplitude (volume) with the other. The electric signals from the theremin are amplified and sent to a loudspeaker.Wiki: https://en.wikipedia.org/wiki/ThereminI'm working on open source open hardware digital theremin project.This PCB is Oscillator for Digital Theremin project based on Teensy 4.1 MCU board.Two oscillators are needed for theremin - one for pitch antenna and one for volume antenna.Low noise stable dual colpitts LC oscillator with 3.3V square wave output (500KHz..2MHz, depending on inductor L).Power supply: DC +3.6..+6V 50mAConnect air core single layer inductor 1..3mH and 10mm copper tube as antenna.Can be used in digital theremin project.Teensy MCU is measuring frequency on input pin by capturing of timer counter every raising and falling edge of signal.Additional filtering is used to collect enough bits of frequency.Teensy 4 arduino library for theremin sensor:https://github.com/fpga-theremin/theremin/tree/master/teensy4theremin/firmware/sketches/src/FreqMeasureDMAProject topic on Thereminworld site:http://thereminworld.com/Forums/T/32640/teensy-40-600mhz-arm-cortex-m-7-mcu---ideal-for-digital-mcu-based-theremin?Page=0LTSpice model of oscillator: https://github.com/fpga-theremin/theremin/blob/master/teensy4theremin/ltspice/2020_npn_pnp_osc_v15.asc

All you need is some capcitors some resistors and one tiny NE555P IC. and of course this PCB board. This is just a fun project that emits tones of different frequencies. The change in resistance decides makes the Ic emit diifferent tones. This board contains 8 push buttons and 8 resistors.In the v2 I will add a variable resistor and many other components too.You can use upto a nine volt battery for this piano and you are free to use this on any of your projects.That's it .. i am not much of a talker. You know everything .... its a small project . Anyway my keyboard got burned and i am using a very old one so I dont feel like typing Oh! and please check out my channel : www.youtube.com/innovationtech(the picture is clickbait dont tell me you belived it)If you buy this PCB it will be a great help to me since I require funds for my research in Electronics. My parents buy me the normal modules and all that. But I need a bit more to buy a raspberry PI4.Thank you if you read this :)

RD06HVF1 OR RD15HVF1 RF POWER AMPLIFIER

RF pulse generatorshield for arduino UNO.Frequency goes from 1.5 MHz to 2.5 MHz (filter can be changed)Minimum pulse width of 5 us and minimum repetition delay of 200 ms.The output is fixed to 1V but R4 can be updated to a potentiometer.Please refer to dayspringTECH designs when use it.