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This inexpensive FM radio receiver antenna booster uses the BF324 TO92 style pnp transistor in a grounded-base configuration. The circuit may be used as a....

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I had heard some stories in the past concerning how poorly the 555 ran below Vcc = 5V, so I embarked on an endeavor to see if I could improve operation. Th....

For maximum efficiency, set MAX_STEPPERS equal to the number of stepper motors that you are controlling (but never more than 4). Motors are referred to by their indices 0, 1, 2 and 3. On the QCard there is a trade-off between the number of motors being....

2 versions. First is one based on your schematics, except that I`ve changed those smd capacitors for standard through hole ones. Second one is somewhat modified. I`ve excluded transformer and put in standard dc jack. Also, pic and display header are located....

This study is made possible by the availability of a motor potentiometer from All Electronics at small cost. The item is catalog number MPOT-10K, and costs $4. 00. It is manufactured by Alps, and the motor is marked MD157320, the body 725t 10BX2. The....

This diy digital thermometer circuit can measure temperatures up to 150?C with an accuracy of ?1?C. The temperature is read on a 1V full scale-deflectio...

A friend of mine bought a fairly new (only a couple of years old) Fender 60W combo off a guy he knew for £5. The original owner had taken it to three different repair shops, and been told it wasn`t worth repairing. I told my mate it couldn`t be much, and....

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The LT3494/LT3494A are low noise boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts use a novel* control technique resulting in low output voltage ripple as well as high ef ¬ciency over a wide load....

Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals. This design should fulfil their needs, featuring three inputs with....

The following graph shows the measured temperature rise above ambient for a typical range of power supply voltages. The upper two plot lines are for no heatsink, with the LM4702 mounted above the PCB (as it normally would be) and mounted below the PCB (which....

Hi to all So I have come to a point where I was able to think about a certain circuit design and write the Assembly code program for my 3 level mini ....

This is a simple low impedance preamplifier circuit diagram. It used to amplify an audio signal. This circuit use a 12Vdc sources and very simple because work with less components...

The resistance of my heater is made of 9$Omega$ 3mm diameter nichrome wire. On 240V(rms) voltage this makes 25A(rms) current. I have an access to a mains line capable of delivering 30A, so in theory I will be able to drive heater at full load. In reality I....

This circuit have an advantage over ordinary CONTINUITY testing Device, usually we are using multimeter to check the continuity of a circuit. It is not suitable to check the continuity of a circuit with high Impedence or resistance like Transformer,....

This circuit is a real gem! Easy to make and more sensitive than many commercial devices available. It`s based around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor. Unlike most other simple EMF detectors, this one has a meter....

Integrated AF power amps have seen great improvements in recent years offering improved power and easier use. The TDA1519C from Philips contains two power amplifiers providing 11 W per channel stereo or 22 W mono when the two channels are connected in a....

By the dual sound multi-frequency encoding signal, the circuit modulates the emitted carrier frequency, and it composes a DTMF encoding wireless calling system circuit. The circuit uses DTMF encoding circuit UM97085 and decoding circuit YN9101 to form a....

This circuit is Wein Bridge Sine Wave Oscillator. The main problem in producing low distortion, constant amplitude sine wave to get the right loop gain amplifier. By using the 2N3069 JFET as variable resistor in the feedback loop voltage amplifier, this can....

The above circuit is a fluid level meter that converts the level in the container on the left into a single-digit number, from 0-9 on a seven-segment display. In this case, 0 (zero) represents the lowest level, and 9 (nine) is the highest level. When in the....

Here, S1 and S2 are normally open, push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load....

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The circuit is not only used for the latch output, but also for non - latched output, SB is control switch. When SB and VDD are turned on, it is in the latch output state, then the sixteen output ends are out control of Io output state; when SB and Io output....

As they did with the monotron synthesizer, Korg has quietly released schematics for its the analog drum synthesis portion of its monotribe synth and step-sequencing rhythm machine. You just see the bits that make the drum sounds, but that`s the interesting....

As the number of stations increased and the power levels also increased; receiver performance had to improve. The pentagrid converter, such as the 6BE6 tube (British EK90 valve), was introduced which was optimized for mixer performance. This included the....

When adding an alternating current signal to the capacitor, the wave position (the phase) of the charging current of the capacitor and the voltage of the capacitor shifts by 90 degrees. When adding an alternating current signal to the coil, it changes....

The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR..

We will describe the function of a digital stopwatch, 0 G 99 sec. The function of the stopwatch, relies in the use of 4 integrated circuits, which in this case belong to National Semiconductor ( It is obvious that other integrated circuits can be used to....

2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits. It can be used as a booster amplifier for existing....