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Posts tagged CD74HC4017

Driver circuit LED Chaser

Driver circuit LED Chaser CD74HC4017, MM74C14 Driver circuit LED Chaser CD74HC4017, MM74C14 Parts List IC1 MC14584BCP IC2 CD74HC4017N T1 2N3904 or 2N4401 NPN transistor D1 to D8 1N4148 or 1N914 Diodes 10 LEDs Blue, green or white Ultra-Bright LEDs with Vf = 3.2V or less at 20mA R1 100K 1/4W resistor R2 1M Linear-taper potentiometer […]

Led Strobe

6v led strobe circuit using CD74HC4017 and MM74C14 6v led strobe circuit using CD74HC4017 and MM74C14 Led Strobe 1 IC1 MC14584BCP IC2 CD74HC4017N T1 2N3904 or 2N4401 NPN transistor 8 D1 to D8 1N4148 or 1N914 Diodes 10 LEDs Blue, green or white Ultra-Bright LEDs with Vf = 3.2V or less at 20mA 1 R1 […]

Portable detector

Portable detector Kristal Checker – Krystal Detector circuit using BC107 Kristal Checker – Krystal Detector circuit using BC107 Portable detector R1 ………….. 39K ohm R2 ………….. 1K ohm R3 ………….. 100K ohm C1 ………….. 680pF C2 ………….. 150pF C3 ………….. 1K pF C4 ………….. 4,7K pF TR1 …………. BC107 TR2 …………. BC107 D1 ………….. 1N60 […]

Power Supply

Dual Power Supply circuit using Transformers This is dual power supply using voltage regulator BC547B and Dioda. It’s the best and simplest choice for most non-critical applications. The 3 terminals are input, ground and output. The Dioda can provide up to 1A load current and it have onchip circuitry to prevent damage in the event […]

Circuit Diagram Converter trigger signal causes the 555 to discharge the capacitor for synchronization

LM1881 is used to do all the grunt work of separating the sync signals from the composite video. The chip provides the vertical sync on pin 3 for the vertical oscillator, and composite sync on pin 1 for the horizontal oscillator. The intensity signal comes from the composite video signal itself, but is negative. I […]

Simple Audio Circuit

Simple Audio Circuit using LM386

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