Tuesday, September 22, 2009

Osilator Gelomabang Kotak varibel 1Hz-10Khz

This is a Circuit of square wave generator using IC uA741. The circuit uses positive feedback for Schmitt trigger action and negative feedback for timing of the wave form.

Let us presume that the output is high and the capacitor C1 is fully discharged.C1 now starts charging via R2 and R1. When the voltage across C1 rises above that the Junction of R3 & R4,the output quickly switches to fully negative voltage.C1 now starts discharging and charges in the opposite direction.Again,when the negative voltage across C1 falls below that at pin 3,the circuit switches back quickly to the fully positive output value.The cycle repeats endlessly.

Osilator Gelomabang Kotak
Skema Rangkaian Osilator varibel 1Hz-10Khz

* The circuit has to be powered from a +9/-9 V DC dual power supply .
* The frequency of output can be varied by varying POT R1.
* The frequency range can be adjusted by changing the value of R3,R4 or C1.


The UA741 is a high performance monolithic operational amplifier constructed on a single silicon chip. It is intented for a wide range of analog applications.
  • Summing amplifier
  • Voltage follower
  • Integrator
  • Active filter
  • Function generator
The high gain and wide range of operating voltages provide superior performances in integrator, summing amplifier and general feedback applications. The internal compensation network (6dB/ octave) insures stability in closed loop circuits.

lay out Ic UA741
Absolute maximum rating Ic UA741
  • Symbol Parameter UA741M UA741I UA741C Unit
  • Supply voltage (VCC) ±22 V
  • Differential Input Voltage (Vid ) ±30 V
  • Input Voltage (Vi ) ±15 V
  • Power Dissipation (Ptot) 500 mW
  • Storage Temperature Range (Tstg) -65 to +150 °C

Skema Rangkaian Elektronika