When testing circuits on a breadboard or my modules, I often need jumper wires with non-standard length. Yes, there are packs of factory wires in shops, but why buy, when you can make them? =)
Monday, September 29, 2014
Saturday, September 27, 2014
Atmega8/48/88/168/328 EV-X2 board
Today I've made another MCU-based device: breadboard-like unit with Atmel Mega88 MCU core.
EV-X2 board with my USBASP connected |
Device contains:
- Built-in 5V supply (L78M05) for MCU
- 3pcs 5V outputs for external devices
- Onboard AVRISP socket
- Reset button
- Clamping zeners for ADC6 and ADC7 inputs
- Switched I2C pull-up's (not exists on photos, I don't have dual DIP switches now, it will be installed later =( )
Wednesday, September 17, 2014
Open-source electronics calculator
Features
- Calculator for MC34063 (all converter types)
- Resistor voltage divider (simple with match finder and 3-element with pot trimmer)
- Basic calculator (current, power, etc.)
- LM2576 buck converter + Vout calculator
- TL431 reference calculator + part match finder
- Zener diode references and calculator
- LED series resistor calc
- Atmel MCU timer calculator
- Voltage drop in a wire/cable
- Parallel/series element connection
- Resistor color band decoder
- Reactive resistance (L/C) calculator
Build links and source code (Delphi 7) available on Google Code.
Browse build archives on Google Drive
Monday, September 8, 2014
Tuesday, September 2, 2014
DC-DC Boost LED driver (based on MC34063)
New update of my DC-DC boost LED driver (full story you can see here (in Russian)). Added output overvoltage protection (D2,D3) and D1 changed to Vishay 30BQ100. Also I've added simple amplifier for current-sense resistor, so it can be now 1W (1 Ohm for 700mA LEDs, 2 Ohm for 350 mA).
Inductor: 60 turns of 18AWG copper wire on T90-52 core (I've used inductor from dead ATX PSU).
Please note: There is no short-circuit protection for output!
Some other notes.
Inductor: 60 turns of 18AWG copper wire on T90-52 core (I've used inductor from dead ATX PSU).
Please note: There is no short-circuit protection for output!
Some other notes.
- Overvoltage limiting 1W zener diodes D2 and D3 may be changed to single 0.5W zener for appropriate maximum output voltage. For example BZX55C47 for max. 47V output.
- Maximum output power depends on primary power supply maximum load capability, current sense resistor R1, MOSFET Q1, inductor coil and flyback rectifier D1.
- This circuit cupports max. 16V input (limit by MOSFET driver).
- NCP3065/66 is more suitable for CC LED driving (lower feedback voltage) but I don't have them now for test.
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