To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adaptors available in the market are generally costly and supply an unregulated DC. To overcome these problems, an economical and reliable circ… Read more »
Amplifier
12V Powered 12V Lead Acid Battery Charger with Indicator
Some of you might wonder why a charger is needed at all, to charge a 12 Volt battery from a 12 Volt source! Well, firstly the “12 Volt” source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current… Read more »
Dual Regulated Power Supply Circuit Diagram
In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil shou… Read more »
5 to 15V Regulated Power Supply
Regulated Power Supply This project is a normal DC regulated power supply that is a variable DC voltage range from 5V to 15V. It can supply current up to 400mA to power the various circuits for your electronic projects. The voltage output is varied… Read more »
10,000x With One Transistor
For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous transi… Read more »
50W Electronic Amplifier (Rise)
This electronic amplifier project is an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a top quality audio class AB amplifier in hi-fi applications. It's low noise and distortion, wide bandwidth and nice output … Read more »
Battery Charger
- High Power Car Battary Eliminator22 Dec 2015undefined
To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adaptors available in the market are genera...
- 12V Powered 12V Lead Acid Battery Charger with Indicator04 May 2015undefined
Some of you might wonder why a charger is needed at all, to charge a 12 Volt battery from a 12 Volt source! Well, firstly the “12 Volt” source will ...
- Automatic Battery Charger03 Oct 2014undefined
Normally, chargers available in the market do not have any sort of control except for a ro-tary switch that can select different tap-pings on ...
- simple Mobile Phone Travel Charger02 Oct 2014undefined
At this point is an ideal cellular phone charger using 1.5 Volt ballpoint cells to charge mobile phone while wandering. It can refill cell phone bat...
- Li-Ion Battery Charger Circuit Diagram16 Sep 2014undefined
The LP2951 regulator is manufactured by National Semiconductors. The choice of values is from an application note Battery Charging, written by Che...
- A Car Battery Monitor14 Aug 2014undefined
A close call on the road can really focus your mind on the importance of having a battery monitor in a car. I had been enjoying a pleasant wee...
Audio
- Universal Active Filter Circuit Diagram11 Dec 2014undefined
The circuit as shown gives the bandpass operation the transfer function calculated from FBP(s) = where = 1 + s/Qo>0 + s2/w02. The cut-off frequen...
- Funk (Twang) Guitar Effect Box Circuit Diagram06 Dec 2014undefined
This is an audio effect circuit that give extra oscillation to your guitar, percussive, or semi percussive instruments, you can call it a funk box...
- Simple Active crossover Circuit Diagram with TL07403 Dec 2014undefined
This is a Simple Active crossover Circuit Diagram with TL074. An audio source, like a mixer, preamp, EQ, or a recorder, is fed to the input of the ...
- Single Chip Theremin Circuit Diagram01 Dec 2014undefined
This schematic diagram show a single chip Theremin circuit. Theremin is an electronic music instrument which sense hand movement to control t...
- Simple HiFi Expandor Circuit Diagram with De-emphasis28 Nov 2014undefined
This is the schematic design of HiFi Expandor Circuit with De-emphasis. The circuit is based NE570. The NE570 can be used to construct a high perf...
- Build a 60-dB Range Compressor For Audio28 Nov 2014undefined
A 60-dB Range Compressor circuit shown in the schematic diagram below can produce consistent output of 1.4V P-P over entire 60dB range that is very...