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4 Band Resistor
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Total Found: 453
Discrimination TR-IB Metal Detector Circuit
The metal detectors can be classified according to their principle of operation in those three categories: BFO, TR/IB and PI. Each of these methods has advantages as well as disadvantages. The ideal metal detector (do not look for it because it does not exist). It should take advantage of all the advantages of all methods while eliminating their...
Construction of 50Watt 8Ω two-way Hi-Fi Speakers
The presented speakers are distinguished for their small dimensions and their extraordinary sound. Our home space is often limited and prohibitive for large speakers. This limitation does not mean that we will stay without high Sound Quality. Its design is simple, low cost and is easy to construct. Speaker types are too many and are designed in...
1W UHF Linear Amplifier with BLW33
This circuit is an amplifier for small transmitters operating in the UHF band, specifically in the 450-800MHz range. The amplifier works in class A and we used the well-known Philips BLW33 transistor for its manufacture. The construction, although simple, can be said to be quite critical due to the high frequency singularity. To achieve this, a...
Direct Box (instant music recording instrument for Musicians)
The sound is taken from a musical instrument in two different ways. Through a microphone that is placed in place by the instrument amplifier or via a direct connection between the instrument and the mixing console via a direct-box device. The benefits of direct-box versus microphone is that each microphone added to the scene is an additional...
Power Audio Amplifier DMOS 2x100W using two TDA2794
The TDA 7294 of T-MICROELECTRONICS is a monolithic integrated circuit in a "Multiwatt 15" shell designed in principle to be used in amplifiers or class AB in high-fidelity applications such as stereo, active speakers, television receivers, and more. Thanks to the large feed area and the capability to offer a very high current at the outlet, it...
LM4561 LM4562 consisting of 170W power amplifier circuit
Figure (a) shows the output amplifier circuit 170W at 4 loads; LM4651 is a former circuit class D amplifier, a 28-pin DIP package, the internal equivalent circuit is shown in (
50W class AB amplifier
Fans are hoping to make a high-quality amplifier, but the most outstanding publications published on the circuit, they often too complex and difficult to start 6 This article d
Single-ended Class A amplifier circuit diagram of 6N1 + 6P3P
Electronic tube amplifier lovers started his art that simple, excellent single-ended Class A circuit should be the first choice. Single-ended Class A tube amp with a mellow, sw
Construction 25W single-ended Class A tube amp circuit diagram EL156
Danji mellow, transparent, natural sound, sweet, sincere, tireless listening to long, full of humane color. In building a harmonious and beautiful life, tube amps have become a
Class push-pull tube power amplifier circuit diagram 2A3A
FIG. 2A3A low direct thermal resistance transistor, its resistance is only 800, so the output transformer primary screen to screen to load impedance 3.5k Cong. Push-pull amplif
ESL amplifier circuit diagram
When connected to popular Stax Class 1 electrostatic headphones, the design shown in the figures may be on the full audio bandwidth
300B tube single-ended Class A amplifier circuit diagram
300B tube single-ended Class A amplifier circuit is as follows:
The Class A series resonant inverter portrayed is well-known and respected for its high efficiency, low cost, and small size, provided that operating frequency is greater than about 3 kHz.
PC audio amplifier 12Watt
The circuit uses the TDA2030 which is a monolithic integrated circuit in PentawattÂ® package, intended for use as a low frequency class AB amplifier. Typically it provides 14W output power (d = 0.5%) at 14V/4ÃŽÂ©; at Â± 14V or 28V, the guaranteed output power is 12W on a 4ÃŽÂ© load and 8W on a 8ÃŽÂ© (DIN45500). The TDA2030 provides high output...
A JFET (Ql) serves as the oscillator. D2 helps to stabilize the transistor by limiting positive sinewave peaks and stabilizing the bias. Output from Ql is supplied to a class A buffer, Q2. It operates as a broadband amplifier by means of Tl, which is untuned. Output amplifier Q3 is also a class A stage. A low-pass, single-section filter is used...
22 Watt power amplifier with TDA2040V
This circuit uses the TDA2040V which is a monolithic power amplifier IC intended for use as a high quality, class AB audio power amplifier. Typically it provides 22W output power into 4ohm with 0.5% distortion, from 32V supply. The device is designed to operate from a split power supply and no electrical isolation is needed between the mounting...
In the circuit, Ql and Q2 are connected in the classic SCR or thyristor configuration. Where higher input voltages or minimum component count are required, the circuit for thyristor boost can be used. The thyristor is running in a linear mode with its cathode as the control terminal and its gate as the output terminal.
This audio amplifier design approach employs TMOS Power FETs operating in a complementary common- source configuration. They are biased to cutoff, then turn on very quickly when a signal is applied. The advantage of this approach is that the output stage is very stable from a thermal point of view. U1 is a high slew-rate amp that drives Q3,...
Model Glow Plag driver circuit
model airplanes, boats, cars and use of ignition of glow plugs for their miniature (O. Bcc to 15cc) internal combustion engines. These engines happen with the heavy batteries on board, HT coil, and "condenser" spark required for ignition classic, while simultaneously developing much higher RPM (and thus power) as the compression ignition...
This circuit is basically tbe classic bucking regulator, except it uses a TMOS N-channel power FET for the chopper and creates its own supply for the gate control. Tht unique aspect of this circuit is how it generates a separate supply for the gate circuit, which must be greater than Vvv. When power is applied, C2 charges, through D2, to +12...
Low-Noise Audio Preamp
A low-noise LT1115 (Linear Technology, Inc.) op amp is coupled to a class-A buffer amplifier to produce a variable g
This circuit design is a class A amplifier employing both ac and de feedback. Bias is stabilized at 15 mA of the collector current using de feedback from the collector. The ac feedback, from collector to base, and in each of the partially bypassed emitter circuits, compensates for the increase in device gain with decreasing frequency,...
In the 100-kHz application from left to right, the coupling network feeds into the receiver ~section on the bottom of the chip. (The external components are summarized later.) The receive data output is pulled up via RPuLL ~ 10 K!l. A minimum current of 10 mA sets the voltage drop across RpuLLÂ· Another voltage supply, VLoGJc, is shown if the...
Low ripple power supply
This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary), Ql, Q2, and R2 may be regarded as a power darlington transistor. ZDl and Rl provide a reference voltage at the base of Ql. ZDl should be chosen thus: ZDl = Von-1
1 Watt 2.3 ghz amplifier
Simplicity and repeatability are featured in this 1 watt S-band amplifier design. The design uses an MRF2001 transistor as a common base, Class C amplifier. The amplifier delivers 1 watt output with 8 dB minimum gain at 24 V, and is tunable from 2.25 to 2.35 GHz. Applications include microwave communications equipment and other systems requiring...
High frequency signal generator
A tapped-coil Colpitis oscillator is used at Ql to provide four tuning ranges from 1.7 to 3.131Hz, 3.0 to 5.6 MHz, 5.0 to 12 MHz and 11.5 to 31 MHz. A Zener diode (D2) is used at Ql to lower the operating voltage of the oscillator. A small value capacitor is used at C5 to ensure light coupling to the tuned circuit. Q2 is a source-follower buffer...
Uses CA3130 BiMOS op amp that operates at a frequency of 1 kHz. With rail-to-rail output swing, frequency is independent of supply voltage, device, and temperature.
27Mhz and 49Mhz rf oscillator-transmitter
The modulator and oscillator consist of two NPN transistors. The base of the modulator transistor is driven by a bidirectional current source with the voltage range for the high condition limited by a saturating PNP collector to the pin 4 Vreg voltage and low condition limited by a saturating NPN collector in series with a diode to ground. The...
Four-Output Filter Circuit
The classic state-variable (two-integrator) filter (see Fig. A) is famous for its insensitivity to device parameter tolerances, as well as its ability to provide three simultaneous separate outputs: high pass, bandpass, and low pass. These advantages often offset the fact that a quad operational amplifier is needed to implement the circuit. A...
In this circuit, a 2-MHz clock is divided by eight in Ul, providing a stable 250-kHz carrier. Ql and Q2 buffer the clock and provide a low-impedance drive for op amp U4, which is a high-gain amplifier and integrator. U4 accepts audio inputs and converts the 250-kHz square wave into a triangular wave. The summed audio and triangular-wave signal...
UHF TV Linear Amplifier (450-800MHz)
This structure is an amplifier RF, covering the range of UHF and intended for small TV transmitters, working in the channel UHF. The amplifier can enhance any video signal to the region UHF (450-800MHz). The circuit operates in class A and uses the known transistor BFQ68. The construction, though simple, we can say that is quite critical, due to...
This circuit can be used in telephone lines for speech activity detection purposes. This detection is very useful in the case of half-duplex conversation between two stations-in the case of siroultaneous transmission of voice and data over the same pair of cables by the method of interspersion data on voice traffic, and also in echo...