Frequency generator circuit using LM3909
Mini Projects
This is a simple Frequency generator circuit using LM3909. The IC is almost all you know it. Because there is a famous story of its use as a flashing light to save energy and external devices. But in fact, it can also be the same ICs frequency generator. Because the LED flash by voltage as The output voltage time to time, thus creating a virtual frequency out there. As circuit in Figure 5 can be made ??out in the frequency range of 100 Hz to 10 KHz. Figure 1 The circuit diagram of Frequency generators circuit using LM3909 For application …
Simple 555 ICs Tester Circuit
Meters & Detectors
Most IC-555 is used to generate frequency, and sometimes we need to know. Is it good or bad? But normal multimeter cannot check it. Thus, I make a simple 555 ICs tester circuit. Which is tested correctly and faster. How it works Resistors R1-R3 acts as limit current and reduce voltage to LED1-LED3. Which is LEDs show state on “Trigger” or “Low” or “High”. The Diode D1 is set voltage to pin 2 less than 1/3 VCC (0.7 volts). When slide switch S1 at position 2 (Trigger IC). Before apply voltage to this circuit, we must put the test IC …
Two divide counter circuit using IC-4027
When you want to decrease the frequency in 2 digital times circuits or Divide Frequency by 2 counter. I advises use IC 4017, because seek easy cheapness can be usable good various. Related Links digital counter circuit More circuits about IC 4017 Frequency Divider circuit Digital frequency divider 10 Hz Timebase by IC 4017 Squarewave Oscillator by IC LM339 XR2206 Function Generator Cmos Logic Clock Oscillator by Ic 4011 X tal Oscillator Frequency by 74LS04
Simple audio alarm with transistor
Alarm systems
      The work of the circuit when press switch S1 will have the electric current flows through R1 go to pick the electric charge at C1 at a pin B of Q1 as a result, will have electricity pressure then until make Q1 work.       When Q1 work Q2, as a result work with, be make have current flow through pin E come out the way pin C of , Q2 change R4 go to a loudspeaker. By C2 will charge when C2 charge with full speed ahead pin B of Q1 have low voltage poverty Q1 do not work. The Q2 …
Sine wave oscillator low frequency-constant amplitude
Basic Circuits
In the Sine wave oscillator circuit often to be use the thermistor and Incandescent lamp, for upset the output of circuit has fixed value, the resistance of the thermistor dependent on temperature and as a result to voltage drop across of it. From the slow response of the thermistor make to properties of temperature against resistance is not linear like with that do not distortion value in this oscillator circuit. In this circuit, we use a zener diode in performs this function instead by is used to limit a voltage. Then, the bridge circuit consisting of R1, R2 and C1, …