Wiring Schematic Diagram

This is a 1Hz pulse frequency generator circuit using timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated visually by the LED. An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit. This circuit can be used in applications that require clock pulses

This is a circuit of a 3-phase pulse generator. This circuit produce 3 phase overlapped output similar with 3 phase  AC powerline, you can say this circuit produce the DC pulse version. This circuit Requires only CMOS 4-bit shift register and two CMOS inverters  as the circuit’s  main components. The shift register is configured as divide-by-6 Johnson counter, providing glitch-free outputs. Square-wave clock signal should be provided by external source to drive this circuit, and this clock source should have frequency 6 times of desired output frequency. 

This circuit very useful to use waveform generator in electronic experiment and design. Using this circuit you can produce sine wave oscillation. Beside sine wave oscillation, you can also produce triangle or square wave function.

The MAX038 is at the heart of the waveform generator circuit. complementary function is given by the IC to build a generator waveform / function generator. To build a generator circuit complete waveform, you can give some modification like change the inputs of A0 and A1 to generate the other type of wave. Put A0=X and A1=1, you will generate sine wave using this circuit. Change both A0 and A1 into 0 will produce square wave nad if you put A0=1 and A1=1, you will get triangle wave. Using current, you can control the frequency. You can control the frequency using microcontroller or digital interface if you disconnect the 20K RIN from REF (pin 1) and connect it to a DAC. By controlling the current using a phase comparator output that compares the sync output (pin 14 of MAX038) and a reference clock from quartz crystal oscillator, you can even control the chip using a quartz crystal (PLL). Since this frequency generator can generates very wide operating frequency (0.1 Hz to 20MHz), it’s become very interesting.

This Simple Sine Wave Generator circuit was designed to provide a valuable test equipment tool for sound reinforcement systems like guitar amplifiers and the like. Used in conjunction with an ac voltmeter or other ac measurement tools, it can be of considerable help in setting and controlling levels through any amplifying chain.

The Simple Sine Wave Generator circuit is based on a simple, two-transistor oscillator circuit, featuring very high frequency and amplitude stability but avoiding thermistors, bulbs or any special amplitude-limiting device. Three different output frequencies, namely: 300Hz, 1KHz and 3KHz, are provided by switching SW1.

The sine wave output amplitude can be varied continuously (by means of P1) in two ranges: 0 - 77.5mV RMS (219.7mV peak-to-peak) and 0 - 0.775V RMS (2.191V peak-to-peak).A regulated supply is necessary to obtain a stable output waveform. D1 and D2 force IC1 to deliver 6.2V output instead of the nominal 5V.

P1       : 4K7  Potentiometer
R1       : 12K
R2       : 2K2
R3,R5,R7 : 1K Trimmers
R4,R6    : 1K5
R8       : 1K
R9       : 4K7
R10      : 3K3
R11      : 2K7
R12      : 300R
R13      : 1K (Optional)
R14      : 100K
C1       : 22nF
C2       : 3µ3  Polyester
C3,C6    : 330nF
C4       : 56nF
C5       : 22µF/25V
D1,D2    : 1N4148
D3       : LED
Q1,Q2,Q3 : BC550C
IC1      : 78L05
SW1      : 1 pole  3 ways Rotary or Slider Switch
SW2      : 2 poles 3 ways Rotary or Slider Switch
B1       : 9V  PP3 Battery