Space Horticulture Circuit

Posted on Feb 4, 2014

The optimum duty cycle and frequency for the strobe photoperiod needs to be determined. In other words we`re flying blind in regard to optimum frequency and duty cycle. The circuit I designed is 3Hz with a 50% duty cycle. I chose this frequency based upon using a convenient 1-uF capacitor, for a 555 timer IC. The schematic is shown in figure 2 (be

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

low). The output from the 555 timer (pin 3) is connected to the base of NPN Darlington Transistor (TIP120) T1. The NPN transistor switches the current on and off to the strobe LED lighting module. There is a voltage drop across the collector-emmiter of the TIP 120 transistor. To insure the equal brightness from both the LED modules, I place a dummy TIP120 transistor, T2, in line with the control LED module (see figure 3, below). The transistor T2 matches the voltage drop across T1 to help supply an equal voltage to the control LED modules. The T2 transistor is kept forward bias (always on), when power is applied through resistor R4 (2. 2K ohm). The voltage drop I measured across the TIP120 transistors is approximately 1. 5 volts. An overall view is shown in figure 4 (above). A 12 VDC wall transformer powers the circuit. The wall transformer is plugged into an inexpensive Radio-Shack AC appliance timer set for a 12 hour on period. The wall transformer supplies voltage to both circuits.

Visit page

Leave Comment

characters left:

Related Circuits

Low distortion audio amplifier Using KA22135

Electronic dimmer circuit touch light

police siren using NE555

Infrared Sensor circuit

IR Light Dimmer Circuit

Isolated RS422 Interface circuit

LPC E2468 circuit

LED Matrix Message circuit

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

Digital code Lock with AT89C2051

Security is a prime concern in our day-today life. Everyone wants to be as much secure as...

Car rear Stop Light Flasher

When we step on the car' s brake, then together with the classic rear STOP ,the third STOP which...

Oscillator-clock generator

This self-starting fixed frequency oscillator circuit gives excellent frequency stability. Rl and...

4046 PLL bassed A roulette wheel electronic circuit with explanation

A roulette wheel electronic circuit can be designed using a 4046 PLL containing a voltage...

speedcontroller TRIAC switching problem

You already appear to have sufficient snubberring around the TRIAC which should eliminate DV/DT...

Power Supply Unit

This article provides a detailed description of our methodology for testing power supplies in...

Battery Powered Infrared Remote Control Extender

This is a battery powered IR Link which may be used in more than one room. The standby current is...