4017 circuits
4017 circuits - related electronic projects and circuit diagrams (schematics), this helps you finding desired informations and facilitates your site navigation through all articles database.
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Power On Indicator
Feb 28th
This Power On Indicator circuit is highly useful to detect the presence of AC in Mains powered instruments such as Lab equipments and battery chargers which are to be switched on continuously. This Non Contact Power Monitor lights an LED when current starts to flow through the power cord of the instrument. CD 4017 Data sheet (more…)
Mobile Scanner
Feb 8th
Here is a device to locate the mobile phone. It emits intermittent flashes and beeps to indicate the presence of an active mobile phone. The circuit becomes active even if the mobile phone is in silent mode. It can be used to detect mobile phone call in noisy environments. Range of the circuit is 15 cms. (more…)
Flashing Brake Light for Motorcycles
Feb 5th
This flashing brake light circuit can be used for motorcycles. When brake-light switch S1 is closed, power is applied to U1 and U2. Two inverters of U2, a 4049 hex inverting buffer, are connected in a low frequency oscillator that feeds clock pulses into U1, a 4017 decade counter/divider. Outputs 0, 2, 4, 6 and 8 of U1 are coupled to the gate of Q1 through a 1N914 diode. (more…)
Electronic pest repeller mice repellant
Apr 17th
Electronic pest rat repellents emit high frequency sound waves to create an acoustically hostile environment that effectively repels rodents from protected areas. Sound is inaudible to people and non-rodent pets. It is ideal for environments were the use of poisons is inadvisable or prohibited. Beware mice, rat and mouse :) . It is known that a mice can hear ultrasonic sounds between 30 KHz and 50 Khz and this is pretty loud for his ears and this electronic rodent repellant does just that. (more…)
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