Archive for May, 2008
2008 May circuits - related electronic projects and circuit diagrams (schematics), this helps you finding desired informations and facilitates your site navigation through all articles database.
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Preselector for SW receivers
May 29th
The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a entrance RF stage field with a relatively high dynamic range. (more…)
Audio amplifiers from class A to T
May 22nd
The final amplifier is the power source of every audio installation. Its job is to convert a small alternating voltage into a powerful signal for driving loudspeakers with as little distortion as possible. (more…)
VOX circuit schematic
May 21st
VOX is a switch ordered by voice, often used at microphones instead of the classic switch button. The vox described here may be connected to almost any type of audio equipment which has an external speaker for coupling. (more…)
NS741 fm stereo transmitter
May 19th
NS741 is an integrated circuit, a small power fm transmitter were left and right audio signals can be modulated in FM stereo with multiplexing. NS741 Description: It is a small power fm transmitter that allows data transmission RDS (Radio Data System). Incorporated DSP generates stable stereo signal and attachment RDS data. NS741 applications: - Wireless microphone - Cd and portable mp3 - Cell phones (more…)
Stun Gun circuit schematic
May 11th
This is a simple stun gun circuit schematic just for learning! In No Way Do I Recommend Building these Stun-Guns or the actual use of them for any purpose what so-ever. (more…)
RF power amplifier 50W BLY94
May 11th
This fm rf power amplifier circuit is built with BLY94 transistor which delivers up to 50W at 175MHz and has a power gain of 7dB, arround 5x power amplification. But in this schematic bly94 is working in 3 meter band, FM 88-108 MHz, so it has a higher power gain, 8dB – 6x. So if we use a good quality trimmers and coils with 7W input rf power BLY94 will deliver up to 50W rf power. If you use it in C class dont connect R1. (more…)
Stereo encoder
May 10th
This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output which is amplified by T1 ( current amplification ). On IC2 pin 10 you can find 19kHz pilot tone frequency. (more…)
Small TV transmitter
May 6th
This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera module it delivers excellent pictures on a standard color or b/w tv. Instead of BFY90 you can use any VHF NPN transistor and instead of BC550 any NPN transistor. (more…)
TLC272 datasheet
May 4th
The TLC272 and TLC277 precision dual operational amplifiers combine a wide range of input offset voltage grades with low offset voltage drift, high input impedance, low noise, and speeds approaching those of general-purpose BiFET devices. (more…)
Class A preamplifier
May 4th
This class A preamplifier has been designed in a symmetrical structure. In the input differential stages we’ve used the dual transistors T1 and T2. Polarisation correction is essential because of the amplification differences and is assured with T12. P2 brings the output voltage to 0. For maximum performances, T7 and T9 surfaces must be in contact, also T8 and T10 surfaces. The T9 and T10 repose current is adjusted to 20mA with P1. Frequency bandwidth is 2.4MHz. (more…)
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