https://www.protechtrader.com/community#project-1https://www.protechtrader.com/image/data/community/7aad3127505765b3959eee8f0d96e308.jpegPink Keyboard Makes Electronics! (1080p Circuit Walkthrough)I made this circuit thingy to show you guys my pink keyboardhttps://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-11742026-07-08T13:37:48-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-1https://www.protechtrader.com/image/data/community/7aad3127505765b3959eee8f0d96e308.jpegPink Keyboard Makes Electronics! (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Pink Keyboard Makes Electronics!.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-1822026-07-08T13:37:48-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-2https://www.protechtrader.com/image/data/community/25e163c9f46468b67958b5f085d6496b.jpeg2nd ed make electronics 7 segment display (1080p Circuit Walkthrough)decade counter issuehttps://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-21742026-07-08T13:54:56-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-2https://www.protechtrader.com/image/data/community/25e163c9f46468b67958b5f085d6496b.jpeg2nd ed make electronics 7 segment display (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for 2nd ed make electronics 7 segment display.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-2822026-07-08T13:54:56-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-3https://www.protechtrader.com/image/data/community/555_timer_metronome_hero_1787022465.jpg555 Timer Metronome for Guitar Practice (1080p Circuit Walkthrough)Built an adjustable 555 timer astable circuit with a potentiometer controlling tempo and a small speaker for click output. Started as the book's basic blinker experiment, then swapped the LED output for a transistor-driven speaker and added a 10-turn pot so I could dial in exact BPM ranges. Next step is adding a second 555 in monostable mode to shape the click into a sharper transient instead of a raw square wave.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-31742026-04-09T12:15:33-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-3https://www.protechtrader.com/image/data/community/555_timer_metronome_hero_1787022465.jpg555 Timer Metronome for Guitar Practice (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for 555 Timer Metronome for Guitar Practice.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-3822026-04-09T12:15:33-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-4https://www.protechtrader.com/image/data/community/tc_showcase_event_counter.jpgTwo-Digit Arduino Event Counter with CD4026 (1080p Circuit Walkthrough)Chained two CD4026 decade counters together using the carry-out pin to build a two-digit 7-segment counter that increments on a push-button press with basic debounce handling in code. Used it to count laps during a hallway robot race with my kids. Reset button wired to pin 15 clears both digits back to zero instantly.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-41742026-04-22T18:40:07-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-4https://www.protechtrader.com/image/data/community/tc_showcase_event_counter.jpgTwo-Digit Arduino Event Counter with CD4026 (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Two-Digit Arduino Event Counter with CD4026.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-4822026-04-22T18:40:07-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-5https://www.protechtrader.com/image/data/community/light_activated_nightlight_her_1787022558.jpgLight-Activated Nightlight Using an LDR and Transistor (1080p Circuit Walkthrough)Simple photoresistor voltage divider feeding a transistor base that switches on a string of LEDs once ambient light drops below a threshold. No microcontroller involved — fully analog. Mounted the LDR facing a window so it automatically turns the LED strip on at dusk and off again at sunrise. Tuned the threshold by swapping the fixed resistor value a few times until the trigger point felt right for the room.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-51742026-05-05T09:22:51-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-5https://www.protechtrader.com/image/data/community/light_activated_nightlight_her_1787022558.jpgLight-Activated Nightlight Using an LDR and Transistor (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Light-Activated Nightlight Using an LDR and Transistor.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-5822026-05-05T09:22:51-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-6https://www.protechtrader.com/image/data/community/tc_showcase_rgb_lamp.jpgArduino RGB Mood Lamp with PWM Fading (1080p Circuit Walkthrough)Used three PWM pins to drive a common-cathode RGB LED through individual current-limiting resistors, with a sketch that smoothly cycles through color combinations using analogWrite ramps instead of hard color jumps. Housed it in a frosted plastic cup for diffusion. Learned a lot about how PWM duty cycle timing actually creates the fade effect while building this.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-61742026-05-19T20:03:44-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-6https://www.protechtrader.com/image/data/community/tc_showcase_rgb_lamp.jpgArduino RGB Mood Lamp with PWM Fading (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Arduino RGB Mood Lamp with PWM Fading.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-6822026-05-19T20:03:44-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-7https://www.protechtrader.com/image/data/community/servo_motor_test_rig_hero_1787022591.jpgPotentiometer-Controlled Servo Test Rig (1080p Circuit Walkthrough)Wired a 10K potentiometer to A0 and mapped the analogRead range to servo angle using the map() function, so turning the knob directly drives a small hobby servo in real time. Built this as practice before starting a bigger robotic arm project. Added a 10-sample moving average to the analog read to smooth out servo jitter, which fixed the twitching almost completely.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-71742026-06-01T15:47:12-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-7https://www.protechtrader.com/image/data/community/servo_motor_test_rig_hero_1787022591.jpgPotentiometer-Controlled Servo Test Rig (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Potentiometer-Controlled Servo Test Rig.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-7822026-06-01T15:47:12-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-8https://www.protechtrader.com/image/data/community/tc_showcase_dc_motor.jpgSimple DC Motor Speed Controller with Transistor + Diode (1080p Circuit Walkthrough)Built a basic PWM-driven motor speed controller using an NPN transistor switch with a flyback diode across the motor terminals, controlled from an Arduino PWM pin. First attempt without the diode caused the Arduino to reset randomly whenever the motor spun down, which turned out to be back-EMF feeding into the board through a shared ground path. Adding the 1N4001 flyback diode fixed the resets completely.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-81742026-06-14T11:29:58-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-8https://www.protechtrader.com/image/data/community/tc_showcase_dc_motor.jpgSimple DC Motor Speed Controller with Transistor + Diode (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Simple DC Motor Speed Controller with Transistor + Diode.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-8822026-06-14T11:29:58-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-9https://www.protechtrader.com/image/data/community/tc_showcase_soldered_chaser.jpgFirst Soldered Protoboard — LED Chaser Circuit (1080p Circuit Walkthrough)My very first fully soldered (no breadboard) project: a CD4017-based LED chaser with ten LEDs lighting in sequence, clocked by a 555 timer astable oscillator. Had a few cold joints on my first pass that caused two LEDs to flicker intermittently, reflowed them following some troubleshooting tips from this community and it runs perfectly now. Genuinely proud of how clean the board looks compared to my earlier breadboard version.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-91742026-06-28T17:05:20-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-9https://www.protechtrader.com/image/data/community/tc_showcase_soldered_chaser.jpgFirst Soldered Protoboard — LED Chaser Circuit (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for First Soldered Protoboard — LED Chaser Circuit.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-9822026-06-28T17:05:20-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTraderhttps://www.protechtrader.com/community#project-10https://www.protechtrader.com/image/data/community/tc_showcase_dual_rail.jpgDual-Rail Breadboard Layout for Motor + Logic Circuit (1080p Circuit Walkthrough)Reorganized a messy single breadboard project into a cleaner two-rail layout — one power rail dedicated to the low-current 555 timer and LED logic, a separate rail (fed from its own battery pack) for the higher-current DC motor, sharing only a common ground. Made troubleshooting dramatically easier since I could isolate whether a problem was in the logic side or the motor side just by checking one rail at a time.https://www.protechtrader.com/image/data/community/instructables/555_metronome_demo.mp4https://www.protechtrader.com/community#project-101742026-07-10T08:51:36-04:00yesTechnology & ElectronicsElectronicsCircuit DesignBreadboardSTEMProTechTraderhttps://www.protechtrader.com/community#project-10https://www.protechtrader.com/image/data/community/tc_showcase_dual_rail.jpgDual-Rail Breadboard Layout for Motor + Logic Circuit (9:16 Vertical Short)Quick vertical circuit demonstration and bench oscilloscope trace for Dual-Rail Breadboard Layout for Motor + Logic Circuit.https://www.protechtrader.com/image/data/community/instructables/555_metronome_short_9x16.mp4https://www.protechtrader.com/community#project-10822026-07-10T08:51:36-04:00yesTechnology & ElectronicsShortsElectronicsOscilloscopeProTechTrader