Handheld Oscilloscope Oscillator Circuit

Posted on Feb 6, 2014

The circuit in the schematic below is an infrared transmitter. The infrared beam is transmitted in a nearly line-of-sight pattern to another device with an infrared receiver. The plotted waveforms are the output voltages of the two intermediate stages (purple and yellow) and the transmitter`s output stage (green). To measure the voltage pulsed acr

Handheld Oscilloscope Oscillator Circuit
Click here to download the full size of the above Circuit.

oss the transmitting IR LEDs, use iMSO-104`s analog input as a traditional oscilloscope. Clip the ground clamp to a suitable anchor point on the circuit, and attach the scope probe lead to the collector leg of transistor T3, as indicated with a green dot in the schematic. The voltage oscillations of T1 and T2, purple and yellow respectively, drive the base voltage of T3 and create the pulsed output. Capacitor C1 only charges when T1 is turned on and conducting, and T2 is turned off with its base voltage pulled high  (meaning that the base voltage is essentially the same as the supply rail voltage) The oscillation frequency is set by the values of four components: R1 and R2, and C1 and C2. There are two ways that these component values affect the frequency.

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