This circuit is commonly used to create LFO (low frequency oscillator) oscillators, for frequencies ranging from a few Hertz to a few Kilo-Herts..
For oscillation to occur in the Hertz range, use capacitances in the range of micro-Henry units. For the Kilo-Hertz range, use capacitances of a few nano-Henry units.
HOW TO IMPLEMENT (Tested from 50Hz to 500KHz):
First see the shematic image below.
The collector resistance value is RC=ZNet and the current is IC=VCC/Znet, for the base current IB=IC/Hfe (Hfe transistor gain), and the base resistance (RB) becomes (VCC-0.8)/IB.
To calculate the value of the coupling capacitor (C-Coupling): Use the capacitive reactance calculator, using this oscillation frequency, and the reactance the value of ZNet.
NOTE: If there is a large discrepancy in the oscillation value, adjust C-Coupling gradually.
DON´T FORGET:Start simulation with DC Power Supply set to 0 Volt.
Calculate the value of (F) frequency, R (resistance) or C (capacitance) by filling in two of the available fields, leaving the value of the desired element blank.
| F | Frequency in Hertz |
| R | Resistance in Ohm |
| C | Capacitance in Farad |
| ZNet | RC Network Impedance in Ohm |
| F | |
| R | |
| C | |
| ZNet | |
e+15 = Peta; e+12 = Tera; e+9 = Giga; e+6 = Mega; e+3 = Kilo; e-3 = mili; e-6 = micro; e-9 = nano; e-12 = pico; e-15 = femto
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