BlogHide Resteemssodnupta (25)in electronics • 6 years agoProject 6: Buck Converter (Adjustable Voltage)Description: Input voltage: 24VAC (RMS) Output voltage: 3.64VDC ~ 16VDC Current rating: 1A Ripple: 24mV Buck converter IC: LM2575 Components: 1N4007 x 4 -> Bridge…sodnupta (25)in electronics • 6 years agoNew Soldering Iron! - Hakko FX888D-23BYsodnupta (25)in electronics • 6 years agoProject 5: 555 timer (Adjustable duty cycle)Description 555 Timer with adjustable duty cycle Frequency - about 4.5kHz Produces square wave Schematic Gallery Top View Bottom View (don't buy cheap soldering…sodnupta (25)in electronics • 6 years agoOscilloscope capture 4: Button bouncing and mitigationProblem: LED turned on by a mechanical switch causes "bouncing" of voltage An LED is turned on and off by a rocker switch. Voltage is measured across the LED. The switch, as with…sodnupta (25)in electronics • 6 years agoOscilloscope Capture 3: Inductive Spike and MitigationRunning DC motor with square wave Purple signal is the voltage at the transistor base, referenced to the common ground Yellow signal is the voltage at the transistor emitter, referenced to…sodnupta (25)in oscilloscope • 6 years agoOscilloscope Captures 7/14/18: Picking up switching controller noise from laptop chargerCharger Plugged to Laptop Frequency reads about 98kHz We can tell that the charger uses 100kHz switching controller to regulate the voltage. Charger plugged off. Switching frequency…sodnupta (25)in power • 6 years agoProject 4: Regulated Linear DC Power Supply - Version 1Description: Input Voltage: 120VAC Output Voltage: 9VDC Rated Current: 1A Power Factor: 0.50 Components: NEMA 1-15 power cord -> Not grounded 300mA fuse -> Protects…sodnupta (25)in oscilloscope • 6 years agoOscilloscope Captures7/3/18 Music from audio jack 7/1/18 RS-232 serial communication from DHT11 sensor 6/30/18 DC Motor Noisesodnupta (25)in oscilloscope • 6 years agoFirst oscilloscope! Siglent SDS 1102CML+General Specs Bandwidth: 100MHz Real Time Sample Rate: 1GSa/s Channel: Dual Memory Depth: 2Mpts Rise Time: 3.5ns Vertical Resolution: 8 bit Price: $299 Two passive 100MHz probes included…sodnupta (25)in arduino • 6 years agoProject 3: Arduino, HC-SR04 Ultrasonic sensor, NRF24L01 transceiver, Active buzzerDescription: Ultrasonic alarm system Arduino 1: As a person comes closer to the ultrasonic sensor, an active buzzer will ring with higher frequency. The LEDs will also turn from green, yellow…sodnupta (25)in arduino • 6 years agoProject 2: Arduino, DHT11, DC motor and LCD displayDescription: Read humidity and temperature data from DHT11 sensor Display humidity and temperature data on LCD module Turn on the fan (DC motor) when the temperature reaches 25C…sodnupta (25)in hardware • 6 years agoProject 1: Blinking LEDDescription: Generate square wave output using IC555 Pulse width modulation with diodes Adjust frequency with resistors Components: NE555P x 1 10kOhm resistor x 2 1N4007…