Game feeder controller

Posted on May 29, 2012

The circuit is built around an LM339 quad comparator, Ul, which forms the basis of a Schmitt trigger, timer circuit, and a window comparator. One comparator within the LM339 (pins 1, 7, 6), plus LDR1, R4, R5, R6 and R8, is used as a Schmitt trigger. The timer circuit (which receives its input from the Schmitt trigger) consists of R9, RIO, Rll, R13. The last two-fourth's of Ul (pins 8, 9, 10, 11, 13 and 14) are wired as a window comparator. The two inputs to the window comparator are derived from the charge on capacitor Clâ€”which is fed to pins 9 and 10 of Ul. The other inputs are picked from two points along a voltage-divider network, consisting of Rl, R2, and R3.

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

DiodeD1 is used as a blocking diode, forcing capacitor Cl to discharge through RIO and R13. The window comparator looks for any voltage falling between one-third and two-thirds of the supply voltage. When the voltage falls between those two points, the output of the window comparator (pins 13/14) goes high. Transistors Ql, and Q2 are turned on, when the pins 13/14 junction goes high, energizing the relay, Kl. The energized relay provides a dc path to ground, activating the motor, Ml, which reloads the feeder. The timer circuit also provides immunity from triggering, duei;o lightning. The on-time of relay Kl is determined by the charge cycle of Cl, Rll, and R9 or the discharge cycle of Cl, RIO, and R13. Changing the value of either a resistor or the capacitor, changes the timing cycle.

Leave Comment

characters left:

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Chloroplast solar engines

The heart of the Chloroplast is the Motorola MC34164-3 Micro power Undervoltage Sensing Circuit...

Touch Switch with 555

The modern mechanic switches are improved concerning of old technology. We need however many...

IC Controlled Emergency Light with Charger Circuit Schematic Free With Explanation

The circuit shown here is that of the IC controlled emergency light. Its main features are:...

frequency counter

This design synthesis has considered the survey accuracy of the frequency and measured the...

Electronic Keypad Combination Lock

When wired to a ten-digit keypad, the circuit will recognize one 4 digit combination out of a...

sequential timer circuit diagram using 22

A sequential timer circuit device are used in many applications for initializing conditions...

High Voltage Power Supply for Geiger Tubes

These power supply circuits are generating 500 volts but they may be modified to supply a couple...

Sound operated flip flop

Here given is a circuit in which the status of the output pins of a Flip Flop IC can be toggled...

Simple Headlight Reminders

These two headlight reminder circuits are easy to install and operate on the KISS (Keep It Simple...

Novice CW Transmitter

Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still...

Combustible gas alarm circuit diagram 2 7806 KD28

As shown in FIG alarm by a gas-sensitive sensor element QM, buck rectifier and regulator...