http://www.next.gr/templates/cleancss/img/feed-esyndicat.pnghttp://www.next.gr/http://www.next.gr/video/amplifiers/http://www.next.gr/video/amplifiers/Summing-amplifier-clamping-circuit-l13845.htmlThis circuit is a traditional summing amplifier configuration with the addition of the de clamping circuit. The operation is quite simple; each component-synchronization, color burst, picture information, etc.of the composite video signal is applied to its own input terminal of the amplifier. These signals combine algebraically and form the composite signal at the output. Thu, 14 Feb 2013 00:02:00 MSThttp://www.next.gr/video/amplifiers/Video-pulse-amplifier-l13847.htmlHA-5190 can drive the 75-0 coaxial cable with signals up to 2.5 V pk-pk without the need for current boosting. In this circuit, Sun, 10 Feb 2013 00:02:00 MSThttp://www.next.gr/video/amplifiers/Dc-gain-controlled-video-amplifier-l13846.htmlThis amplifier employs a cascaded op amp integrator and transistor buffer, Q1, to drive the gain control element. Except for a simple modification, the HA-5190/5195 stage is connected as a conventional noninverting op amp, and includes input and output impedance matching resistors R1 and R4, respectively, series stabilization resistor RZ, and power supply bypass capacitors C1 and C2. The circuit differs from standard designs in that the gain control network includes a photoresistor, part of OCl. The optocoupler/isolator OC1 contains two matched photoresistors, both activated by a common LED. Tue, 11 Dec 2012 00:12:00 MSThttp://www.next.gr/video/amplifiers/Fet-cascode-video-amplifier-l13073.htmlThe FET cascode video amplifier features very low input loading and reduction of feedback to almost zero. The 2N5485 is used because of its low capacitance and high YfS Thu, 06 Dec 2012 00:12:00 MSThttp://www.next.gr/video/amplifiers/Ultrasonic-Cleaner-Circuit-l15109.html Ail ultrasonic cleaner is useful to clean certain items. This circuit uses a microcontroller to control timing and give a digital readout, but only the basic oscillator can be used, if desired. RESL, RES2 are piezoelectric transducers driven by power oscillator Ql. Ql is powered by a bridge rectifier-capacitor input filler that operates directly off the ac line. Thu, 08 Nov 2012 00:11:00 MSThttp://www.next.gr/video/amplifiers/Video-line-driving-amplifier-l13844.htmlQ1 and Q2 form a differential stage which single- ends into the LT1010. The capacitively terminated feedback divider gives the circuit a de gain of 1, while allowing ac gains up to 10. Using a 20-fl bias resistor, the circuit delivers 1 V pk-pk into a typical 75-fl video load. For applications sensitive to NTSC requirements, dropping the bias resistor value will aid performance. Sun, 21 Oct 2012 00:10:00 MSThttp://www.next.gr/video/amplifiers/Low-distortion-video-buffer-l13849.htmlThis buffer amplifier"s overall harmonic dis tortion is a low 0.01 % or less at 3-V rms output into a 500-fl load with no overall feedback. The LT1010CT offers a 100 V/p.s slew rate, a 20 MHz video bandwidth, and 100 mA of output. A pair of JFETs, ]1 and J2 are preselected for a nominal match at the bias level of the linearized source-follower input stage, at about 0.5 mA. The source: bias resistor, R2, of ]1 is somewhat larger thao R3 so that it cao drop a larger voltage aod cancel the LT1010CT"s offset. J1 andJ2 provide ao untrimmed de offset of ±50 mV or less. Thu, 11 Oct 2012 00:10:00 MSThttp://www.next.gr/video/amplifiers/Jfet-bipolar-cascode-video-amplifier-l13075.htmlThe JFET-bipolar cascode circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode configura-tioneliminates Miller capacitance problems with the 2N4091 JFET, thus allowing direct drive from the video detector Sat, 29 Sep 2012 00:09:00 MSThttp://www.next.gr/video/amplifiers/Video-amplifier-and-video-detector-l13071.htmlThe circuit has a typical voltage gain of 84 dB and a typical AGC range of 80 dB. It gives very small changes in bandpass shape, usually less than 1 dB tilt for 60 dB compression. There are no shielded sections. The detector uses a single tuned circuit (L3 and CIO) Fri, 28 Sep 2012 00:09:00 MSThttp://www.next.gr/video/amplifiers/Voltage-controlled-variable-gain-amplifier-l12483.htmlThe tee attenuator provides for optimum dynamic linear range attenuation up to 100 dB, even at f = 10 Mon, 17 Sep 2012 00:09:00 MSThttp://www.next.gr/video/amplifiers/Video-Selector-Circuit-l15114.html This circuit selects one of two channels with a logic signal. The unused channel is shorted out, which minimizes crosstalk. The bandwidth at -3 dB is about 8 MHz. Mon, 30 Jul 2012 00:07:00 MSThttp://www.next.gr/video/amplifiers/High-impedance-low-capacitance-amplifier-l13074.htmlThis compound series-feedback circuit provides high input impedance and stable Sun, 22 Jul 2012 00:07:00 MSThttp://www.next.gr/video/amplifiers/Rgb-video-amplifier-l13843.htmlTransistors Ql and Q2 and their associated components provide: a low-impedance output with the necessary power to drive the output stages, give increased gain tohigh frequencies, and peaking the video for enhanced transient response. Emitter followers Q3, Q5, and Q7 provides low-impedance drive to output stages, Q4, Q6, andQS. The output stages, with the color difference signals applied to their bases and the luminance signals to their emitters, perform matrixing. Sat, 21 Jul 2012 00:07:00 MSThttp://www.next.gr/video/amplifiers/Video-gain-block-l13848.htmlThis configuration utilizes the wide bandwidth aod speed of HA-2540. plus the output capability of HA5033. Stabilization circuitry is avoided by operating HA-2540 at a closed loop gain of 10, while maintaining an overall block gain of unity. A maximum block gain of 3 is recommended to prevent signal distortion. Fri, 22 Jun 2012 00:06:00 MSThttp://www.next.gr/video/amplifiers/Two-stage-wideband-amplifier-l13072.htmlA wideband high gain configuration using two SL550s connected in series. The first stage is connected in common emitter configuration, the second stage is a common base circuit. Stable gains of up to 65 dB can be achieved by the proper choice of Rl and R2 Fri, 13 Apr 2012 00:04:00 MSThttp://www.next.gr/video/amplifiers/TV-signal-amplifier-470Mhz-860Mhz-l11754.htmlThis amplifier can amplify to 10dB the RF signal from antenna working as class A and is based on transistor BFQ34 of Philips. The transistor comes in case SOT122A. You may find the BFQ34T in market but better do not use it as it has different characteristics. Sat, 07 Apr 2012 00:04:00 MSThttp://www.next.gr/video/amplifiers/Video-Amp-with-Sync-Stripper-amp-DC-Restore-l3261.htmlThe circuit in Figure 1 transmits 200MHz (-3dB bandwidth) video signals while stripping off the sync pulse and performing DC restoration. It is configured for a typical video cable driver application driving a double-terminated 75 load, where the EL8102 (IC3) is configured for a gain of +2 to ensure unity gain throughout. Sun, 03 Mar 2013 00:03:00 MSThttp://www.next.gr/video/amplifiers/Video-amplifier-l3259.htmlGot some questions about video amps. I`ve seen an NE592 used as a video buffer amp at the end of a 75 ohm line. Used so that the 75 ohm line could drive all kinds of neat processing stuff without affecting the signal (that`s what a buffer is after all, right?) Now National Semiconductor makes an LM592 that`s also a video amp. Do these two chips cross reference to eachother? Mon, 11 Feb 2013 00:02:00 MSThttp://www.next.gr/video/amplifiers/Video-amplifier-with-digital-gain-control-l3260.htmlThe design is based on a switchable array of six Maxim MAX4258 dual-channel video multiplexer-amplifiers, IC1 through IC6. Under control of a 4-bit input word, you can set the number of stages in the gain cascade to three, four, five, or six. Because each multiplexer-amp has a fixed gain of four, each unit change in the stage count changes the overall gain by 12 dB. In addition, you can interpose a 6-dB attenuator between the last and the next-to-last gain stages. The attenuator adds a factor-of-two resolution to the programmed gain and eight distinct gain settings (Table 1). Fri, 14 Dec 2012 00:12:00 MSThttp://www.next.gr/video/amplifiers/Video-amplifier-l3263.htmlPart List R1= 15Kohm+15Kohm R12= 100ohm trimmer C3=4.7pF ceramic R2-3-4= 10Kohm R13-15= 47ohm IC1= LH0032 R5.....9= 1Kohm R14= 10Kohm S1= 1X2 mini switch R10= 820ohm C1= 10uF 63V MKT S2= 1X6 sel. R11= 1Mohm C2-4= 100nF 63V J1-2= BNC connector Sun, 09 Dec 2012 00:12:00 MSThttp://www.next.gr/video/amplifiers/VHF-TV-Signal-Amplifier-l5981.htmlMany times we needed to strengthen a small signal in the region of VHF or FM. The preamplifier that to you we propose offers 20dB in all the region of VHF and it still can reach also their 500MHZ. The amplifier is a circuit of high frequency RF with distinguishable materials. The amplifier as circuit strengthens the tendency of signal with concrete aid, depending on the frequency of signal. Wed, 21 Nov 2012 00:11:00 MSThttp://www.next.gr/video/amplifiers/Video-amplifier-l3256.htmlPart List R1=1Kohm C2-6=100uF 25V C6=100uF 25V R2-3=12Kohm C3=100nF 100V IC1=LM359N R4-5-6=10Kohm C4=1pF ceramic J1-2=BNC connector C1=10nF 100V C5=10nF 100V Wed, 14 Nov 2012 00:11:00 MSThttp://www.next.gr/video/amplifiers/RGB-To-Monochrome-converter-l3258.htmlOften you can get away with running a monochrome monitor on GREEN, but this looks real crappy when viewing color images. These simple resistor networks allow you to display R+G+B on a B/W or CCTV monitor without ghosting. Be shure to set your video card for 60Hz interlaced. Most video cards do give you Csync out on H. You can also run an OLD monochrome EGA or VGA monitor like this, but be shure to hook up the Vsync. This will not work on TTL monitors. Note that some monitors require unusual sync polarities! Tue, 16 Oct 2012 00:10:00 MSThttp://www.next.gr/video/amplifiers/GP-display-controller-l3262.htmlThis is a simple display controller. It can be controlled with a small microcontroller, such as MCS51, 68HC11, Z80, AVR and others. Several years ago, I found an article that controlling a TV with only a PIC micorcontroller, and I surprised to it. It is very interesting to attempt to synthesize video signal with a micorcontroller. However, it is not suitable for practical use because the microcontroller is occupied in synthesizing video signal, it cannot process any other operation. Therefore, this technic can be applied to a toy at the best. It is required a display controller to contorl the video monitor, so I designed and built a simple display controller for RGB monitor and TV monitor. Thu, 27 Sep 2012 00:09:00 MSThttp://www.next.gr/video/amplifiers/Video-Distributor-Amplifier-CA3100-l5980.htmlThis circuit is useful to amplify and distribute video signals with low noise and without losses. The CA3100 is a fast opamp designed to amplify video signals. Set the P1 to control the input signal level to have a clear picture on the TV set. Tue, 14 Aug 2012 00:08:00 MSThttp://www.next.gr/video/amplifiers/Test-Signal-Generator-l3257.htmlThis signal generator uses a three channel DAC to generate Composite video signal (CVBS) and S video signal (Y/C separated) at the same time, left one channel is not used in NTSC format. It is assigned for one of the color components of Y/CB/CR video format. Fri, 13 Jul 2012 00:07:00 MSThttp://www.next.gr/video/amplifiers/High-Quality-TV-Video-I-F-l3255.htmlThe LM1823 is a video I.F. amplifier designed to operate at intermediate carrier frequencies up to 70 MHz, and employ phase locked loops for synchronous detection of amplitude modulation on these carrier frequencies. The high gain, wide AGC range and low noise of the LM1823 make it ideal for use in television receivers, video cassette recorders and in cable TV set-top converters requiring high quality detected base-band video and an audio intercarrier. Wed, 11 Jul 2012 00:07:00 MST