This article will help you to build yourself a high speed inductorless multivibrator. Its features make it a versatile solution in any radio frequency application. There are lots of schemes that oscillate in the 40 - 120MHz range, but they usually use LC circuits, varicaps, pin diodes, controlled by 0 to 30V voltage source. This makes the devices more complicated and a special correction of the output levels of the signal is needed.The proposed design offers a wide range of frequency tuning, stable output levels and is powered by a +5V supply. It is a VCO - a Voltage Controlled Oscillator, and it is controlled by 0 to 5V voltage source, so it can be easily incorporated in any RF equipment. The same circuit can be used for different frequencies with a change of the active elements.The circuit does not have any inductances and is less influenced by electromagnetic sources.
- Simple and low cost design. - Compact and lightweight – smaller than a business card. - No inductors needed. - Tuned to a wide frequency range – from 40 to 120MHz – with a single potentiometer. - Low supply voltage +5V, can be powered from a USB device. - Time to build: Appr. 2.5 hours. - Cost of elements: Appr. USD 4.
- 4 high speed NPN transistors. - 2 schottky diodes. - 11 resistors. - 3 capacitors. - a multiturn potentiometer.
In the zip file (1.2MB) you will find:
- Circuit diagram with EAGLE PCB design. - LTspice simulation of the circuit. - Read me.pdf file with explanations and practical tips. - Pictures of the the device.
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