Posts Tagged ‘4011 cmos’

Easy dry cell charger with CMOS IC 4011

The dry cell charger circuit can be fully charged about 12 hours.When used with a 9 volt supply,the equipments in the circuit for the AA type cell.When using the C and D type cell, should reduce the value of the resistance Rx to be 68 ohms.In charge of the cell, you should not be charged to the same series, may cause cell damage is fully charged.
If the cell voltage is below 1.6 volt,The compared circuit to leave the square wave oscillator by the CMOS gate,then the transistor made a charge until the cell voltage is 1.6 volt.The comparison circuit will cut the charging LED blinks, notice prevents over-charging.

Resonance generators by 4011 CMOS Gate

This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit.This circuit provides a higher frequency, IC1c and includes IC1d. Another one, the frequency range below and include IC1a IC1b.
The low frequency pulse is sent to control the work of another. Diode D1 will IC1c and IC1d a pulse out at low frequencies.The diode D2 will cause the oscillating sound. S1 open voting is oscillating slowly lowered slowly.The discharge of capacitor C1 value of the equipment does not need to be very accurate. SP1 except that it must be a transducer crystal.

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Frequency Doubler with 4011

This frequency doubler uses one CMOS quad, two input NAND gate package type 4011. The frequency doubler proper consists of an inverter IC1B, two differentiating networks R1/C1, R2/C2 and NAND gate IC1A, IC1C and IC1D function as input and output buffers. In Fig.2 exist the pulses in different points of circuit.

Source:http://users.otenet.gr/~athsam/frequency_doubler_with_4011.htm
Thank you.

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