Mains Powered LED Lights
All mains powered LED circuits work with 240 volt AC current. Mains powered LED – Single LED The power diode in the first diagram is designed to discharge the 220n during one half of the cycle so that the capacitor…
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
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Audio Amplifier using LM386
Audio amplifier using LM386 is a power amplifier designed to be used in low voltage consumer applications. Typical applications are like portable AM/FM amplifier, TV sound systems. It requires minimum external parts and operate from wide range of voltage starting…
White LED on 1.5 v Supply
In this post you will find circuit on how we can light up white LED on 1.5 v supply. Heart of the circuit is the transformer winded on 2.5mm by 0.5 mm core using 0.095 mm wire. 2 White LED…
1 Watt Audio Amplifier
Audio AMPLIFIER 1 watt audio amplifier shown below is very simple and easy to make. You can use this in making pocket amplifier for your mp3 player. It can fit in small mactch box size box. Parts List for…
Flashing LED
Alternate red and green flashing LED using 9 volt battery Part list R1,R2 – 100 Ohm R3,R4 – 105 K C1,C2 – 10 μF 25 Volt T1-T2 – BC 548 D1-D5 – Red LED D6-D10 – Green LED 9 Volt Battery
Performance counters and there meaning in JMeter
Common performance counters and there meaning in JMeter. Elapsed time – JMeter measures the elapsed time from just before sending the request to just after the last response has been received. It does not include the time needed to render…
Dark Sensor
Dark sensor using 2 transistor BC547 When light falls on LDR, its low resistance drives the transistor T1 into conduction. This keeps transistor T2 cut-off due to low base bias. The LED does not get power as long as ambient light…
Electrical Appliance Protection
This simple circuit of electrical appliance protection is to protect your electrical appliance during irregular power supply. Normally when power goes off we forget switching off our appliances. Especially in India where power cuts are very frequent we tend to leave…
IP Switching and Load Testing
IP Switching in Load testing The most common use for IP Switching is when load testing against a load balancer. Load balancer typically use the IP address to route requests to a particular Web server in the farm. So if…
Fundamentals of Testing – Testing Principles
Fundamentals of Testing – Testing principles Principal 1: Testing shows presence of defects Testing can show that defects are present, but cannot prove that there are no defects. Testing reduces the probability of undiscovered defects remaining in the software but,…