Posts Tagged ‘IC 4069’

Electronic Chime by IC 4069

This circuit simulates a chime similar to the sound many cars make when the keys are left in the ignition. The bottom two gates form a squarewave audio oscillator that drives the base of the 2N4401, turning it on and off at an audio rate. The top two gates produce a short low-going pulse about once per second that discharges the 10 uF capacitor through the diode.
Original source:http://www.techlib.com/electronics/noisemakers.html

Frequency doubler with 4069

This frequency doubler using a single 4069 hex inverter IC, a frequency doubler can be constructed to give an output pulse train whose frequency is twice that of a squarewave input signal. The signal is applied to the input of N1. It should be a squarewave with a duty-cycle of approximately 50% at level compatible with CMOS logic (3-15V peak to peak depending on supply voltage). The input signal is buffered and inverted by N1, and inverted again by N2, so the outputs A and B of N1 and N2 are squarewave signals 180° out of phase. The output of N1, is differentiated by C1 and R1 and the output of N2 is differentiated by C2 and R2, giving two spike waveforms of C and D, 180° out of phase. The signals are buffered, inverted and shaped by N3 and N4.

These are then combined in a NOR gate consisting of D1, D2, R3 and N5, and finally inverted by N6 to give the frequency twice that of the input signal. The circuit will operate over a wide frequency range. With the component values shown the width of pulses in E and F point is about 500ns, so the duty cycle of the output will be 50% when the frequency is 1MHZ, when the input frequency is 500KHZ.By A.M. Bosschaert

Read More Source:http://users.otenet.gr/~athsam/frequency_doubler_with_4069.htm

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High Voltage Generator for Low Current Applications By 4069

Here is a simple circuit for generating over 100 volts from a 12 volt source for powering low current devices and experiments. The two transistors may be 2N4401 and 2N4403 or similar for lower power applications or higher power devices for heavier loads. If more power is desired then lower the two 10 ohm emitter resistors to 3.3 ohms. When driving power transistors, more drive may be achieved by adding two more gates and resistors in parallel with the two output gates shown. Notice that the two driver gates are simply in parallel with 220 ohm current limit resistors in series with their outputs.

The transformer is an ordinary power transformer but selecting a secondary voltage somewhat below the power supply voltage will give higher output voltage. The frequency is set near 60 Hz by the two 1 Meg. resistors and the 0.01 uF capacitor and this frequency may be varied for driving an audio transformer. The circuit will work well with other power supply voltages but do not exceed the voltage rating of the CMOS gates.

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Read More Source:http://www.techlib.com/electronics/highvolts.html

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