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This decibels meter circuit responds for sound pressure levels from about 60-70 dB(Decibels). That sound is picked up by an 8 ohm speaker, amplified with a transistors stage and LM324 op-amp section. For audio signal input source, a dynamic microphone can be....
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What is A pH Meter? A pH meter is actually a precise voltmeter that measures the generated voltage of a pH electrodes. The requirement of such meter is high....
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This 8V DC power supply was designed for use with an expensive piece of electronic equipment. It features full over-voltage protection as a precaution against regulator failure, either in the supply itself or inside the equipment it is powering. The circuit....
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This White LED lights illuminates your porch with cool white light. The circuit is too simple and energy saving design. Its current consumption is practica...
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The 30 watt amplifier schematic shown below provides an appropriate power boost with an input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the circuit is very stable at my place and provides a clean-output....
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This HD TV UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 ? 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the....
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I`m working on a project with a PIC to communicate with the Raymarine SeaTalk bus. The link below is the part of the schematic diagram of a Raymarine instrument. The logic chip is connected to the TX and RX connections on the right, and the SeaTalk signals....
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The flash type converter is the simplest and the fastest type of analogue to digital converter. The entire digital output word is present just after the propagation delay time of comparators and the encoding logic gates. A typical conversion time of three....
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We can also operate TDA8932B/33(B) from a symmetrical supply. On this diagram, three half supply voltage buffers are disabled. When supplied from a symmetrical....
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Circuit LM3886 High Performance audio Power amplifier schematics Circuit Electronics, Audio Power amplifier is an important part in sound reproduction ina sound system. audio Power amplifier with this power IC LM 3886Audio Power amplifier....
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This design was created at the request of my father. It is designed to operate a 240V a. c. heater, in his Orchid box, to maintain a higher temperature during daylight hours than darkness. Regulator - This is a very simple regulator used here to obtain a....
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Current-control switching-mode power supplies (SMPS) are gaining in popularity because they allow pulse-by-pulse current control and monitoring, making them more reliable and robust than their voltage-controlled counterparts. Current control also eliminates....
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Self switching Power Supply. One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its...
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The metal detector circuit consists of detection oscillator, reference oscillator, mixer and signal display, it is shown as Figure 8-70. The detection oscillator circuit is composed of the time base oscillator ICl, inductor Ll, potentiometer RPl, diode VDl....
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Because of the high voltages found in a Charge & Primary sections it seems natural to look for cable with high voltage ratings, such as neon sign cable, medical X-ray equipment cable & car engine spark plug leads. The first two would be fine for connecting....
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This is the schematic diagram of very simple headphone amplifier circuit. The circuit built using two NPN transistors. You can use transistor BC549C or other NPN transistors such as European equivalent: BC548C, BC547C, BC239, 2N5818 or 2N2222 An audio....
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Build as simple a circuit as possible that will pull a logic line low every time an automotive ignition coil `fires`. My first inclination is to simply attach the `negative` terminal of the coil to the base of of an NPN BJT through a current-limiting....
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This is a simple 12VDC to 220AC inverter circuit that can be used produces an AC output at line frequency and 220AC or different voltage by selecting transformer T1. The 555 IC is configured as a low-frequency oscillator, tunable over the frequency range of....
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Build an h-bridge just to reverse the current, I am controlling speed elsewhere. Can I simply wire up 2 N-Channel MOSFETs and 2 P-Channel MOSFETs into a IO pin from the MC (with resistors of course) or is it more complicated than that...
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Below 10 MHz, the realization of engineering models is fairly straightforward and not critically dependent on pc-board layout. At VHF, parasitic circuit elements and spurious coupling can wreak havoc with attempts to achieve performance at low cost without....
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There are two schematic diagrams showing a series and a parallel circuit that Tesla could have used. The tubes used were a common 70L7GT Half Wave Rectifer that believe it or notare still available today. I know all of you want to see this site but be....
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This circuit will double almost any DC input voltage as well as handling plenty of current. 12 to 24V is just an example. With a few changes, it can also supply any desired output voltage. There are many possible applications. One I can think of would be to....
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Here is a project of a 555 touch alarm circuit with UM66 melody IC. The circuit will produce a melodious alarm sound for a set time period when someone touches the metal plate / touch plate shown in the schematic....
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This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio....
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Hi All, I am currently working on a project that requires a 0-10V DC supply to be converted into a linear fequency range - square wave. for instance....
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The IQ_Demod project illustrates the use of the IQ_Demod_Setup and IQ_Demod_Data components in ADS. These components are part of the ADS behavioral model suite found under the System - Data Models palette. "IQ_demod_ckt. dsn" is a schematic for the....
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When this circuit is connected to a filter and an oscilloscope, the scope displays the filter`s frequency response. A frequency that sweeps from low to high is applied to a filter. An oscilloscope is triggered by* the start of the sweep and ends its trace at....