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Push Off Push On
The ubiquitous 555 has yet another airing with this bistable using a simple push-button to provide a push-on, push-off action. It uses the same principle of the stored charge in a capacitor taking a...
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Auto Power Off
We are surrounded by battery operated equipment of all kinds, and this array is growing still. Manufacturers and designers lean over backwards to make sure that their equipment draws a small current...
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One Transistor Radio
Here is a simple circuit for a one transistor Audion type radio powered by a 1.5 V battery. It employs a set of standard low-impedance headphones with the headphone socket wired so that the two sides...
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Using LM317 with Overvoltage Protection
The circuit diagram shows the over voltage protection as a feature of LM317 linear voltage regulator. Over voltages come from several source or factors which are usually in the form of transients....
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65W Notebook Laptop Power Adapter
Using TOP269EG off-line switcher IC, (U1), in a flyback configuration can be designed a very simple high efficiency notebok laptop power adapter.TOP269EG IC has an integrated 725 V MOSFET and a...
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Color Organ
I have had many requests for this circuit. It was a very popular unit years ago. The basic idea of the project is to make different colored bulbs light at different frequencies of music. The circuit...
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1kH Synthetic Inductor
Inductors can be mimicked quite easily using operational amplifiers. The circuit shown here was developed to have an inductance of 1000 H (say, one thousand Henry) with good damping. Using this design...
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Twin-T RC Notch Filter
The two T-notch filter can be used to block unwanted frequencies or if placed in an op amp as a bandpass filter. the notch frequency occurs where the capacitive reactance equals the resistance (Xc = R)...
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Converting a DCM Motor
We recently bought a train set made by a renowned company and just couldn’t resist looking inside the locomotive. Although it did have an electronic decoder, the DCM motor was already available 35 (!)...
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PWM Modulator
If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. We’ve kept simplicity in mind and used a dual 555 timer, making the circuit a piece of...
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Simple Speech Amplifier Circuit
When we are designing Amplifier circuit we should consider the input audio source and target output device or target loud speaker specification then only we can develop efficient audio amplifier. Here...
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5v Dual Power Supply Circuit
Many Controllers or output actuators requires both positive + and negative – supply with Ground (GND). By using battery power source or USB power source we can not provide those bias to circuit...
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12v and 5v Dual Power Supply
We power most electronic circuits and devices by using 12 volt or 5 volt Regulated DC supply, Hence we designed basic 12v and 5v Dual Power Supply with easily available components, and this circuit can...
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Lamp Pulser Circuit
We can decorate different things by using LED, by adding some effects in LED lighting then it may more attractive. Here Simple Lamp Pulser Circuit designed by using dual operational amplifier LM358. By...
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Door Knob Touch Alarm Circuit
Simple Door Knob Touch Alarm Circuit is constructed by using timer IC 555 and few easily available components. This circuit will give alert sound when some one touch the door knob, It is suitable for...
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Mini Flasher
Multipurpose Mini Flasher is designed by using timer IC LM555 and two LEDs, these two LEDs are glows alternatively according to the timer IC output. By variable Resistor used in this circuit we can...
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White LED Driver Circuit
White LED Driver Circuit using CAT3200-5 designed to work with Li-ion Battery and compact battery power sources. CAT3200-5 is switched capacitor boost converters that deliver a low noise, regulated...
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Indoor Air Quality Sensor Renesas ZMOD4410
Now a days retail consumers are very much concern about air quality inside their house. Several air conditioners are designed to meet their expectations by implementing air quality sensors. Some air...
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Negative Reference Voltage Generator
Negative Reference Voltage Generator Circuit designed by using simple charge-pump inverter and a positive output voltage reference. In this circuit design we don’t use external Resistors or negative...
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Remote alarm for smoke detector
This remote alarm for smoke detector circuit is an application note from the maxim integrated webpage. Here this circuit uses MAX921 Comparator IC, this will detect supply current increase triggered by...
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