Posted on Mar 27, 2013

Inserting two 1-MO resistors, R1 and R2, in the output stage of one of the circuit`s inverters limits the current needed by the oscillator tone more than a few pA. This circuit includes a CD4007 package, which has three CMOS inverters. It forms a standard three-inverter oscillator. Resistors R1 and R2, in series with separate drains on inverter pins 8 and 13, limit the oscillator`s supply current. Capacitor C1 and resistors R5 set the off time of the oscillator, C1; R6 sets the on time. A VN10KM small-power FET, currentlimited by R4, drives two HLMP-3300 LEDs.

Click here to download the full size of the above Circuit.

The LEDs consume about 20 mA for 1 ms. Their average current determines battery life. Since the LEDs in the circuit flash at 1 Hz, the average current drain is about 1/1000 of 20 mA, or 20 p.A. A 9-V battery should last about three years at the current drain-essentially the shelf life of an alkaline battery.

Leave Comment

characters left:

New Circuits



Popular Circuits

CMOS Toggle Flip Flop Switch
Make this Solar Powered Fence Charger Circuit
12KV High Voltage Generator
integrated circuit Improving absolute precision of ADC to balance battery voltage
PIC CW Temp Circuit
periodic timer
digital step km counter with
Active Shortwave Antenna PCB
Black Burst Generator
High-performance quadrature sine wave type oscillator circuit
Power frequency noise filter PC822 schematic
Bank the Chamber of Secrets to prevent security wireless transmitter circuit diagram
With a CD4013 produce laser light remote control switch