Published:2009/6/24 21:41:00 Author:May
This circuit is a three-channeL RGB video amplifer with individual brightness,black level and drive controls. (View)
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Published:2009/6/24 21:45:00 Author:Jessie
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Published:2009/6/24 21:43:00 Author:Jessie
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Published:2009/6/24 21:42:00 Author:Jessie
Instrumentation amplifiers (differential amplifiers) are specifically designed to extract and amplify small differential signals from much larger common mode voltages. To serve as building blocks in instrumentation amplifiers, op amps must have very low offset voltage drift, high gain and wide bandwidth.The HA-4620/5604 is suited for this application. The optional circuitry makes use of the fourth amplifier section as a shield driver which enhances the ac common mode rejection by nullifying the effects of capac itance -to-ground mismatch between input conductors. (View)
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Published:2009/6/24 4:22:00 Author:May
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Published:2009/6/24 3:56:00 Author:May
This simple amplifier will work well with just about any phototransistor. The 741, although designed to operate with a split supply, will work with a single-sided supply as well. (View)
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Published:2009/6/24 20:59:00 Author:Jessie
Use this circuit for checking fundamental HF crystals on a 'Go-No-Go' basis. An untuned Colpitts oscillator drives a voltage multiplier rectifier and a current amplifier. If the crystal oscillates, Q2 conducts and the LED lights. A3 or 6V, 40mA bulb could be substituted for the LED. (View)
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Published:2009/6/24 4:37:00 Author:May
Suitable for HF and VHF receivers, this preamplifier can be mounted on the back of the receiver for a boost in gain. Useful gain is about 17 dB at 50 MHz (View)
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Published:2009/6/24 4:23:00 Author:May
This circuit uses a platinum resistance temperature device to sense temperature. It has a range of 0 to 300℃. The RTD bridge is driven with a regulated 200-μA current to minimize self heating of the RTD. A 5-V supply is used. (View)
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Published:2009/6/24 3:57:00 Author:May
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Published:2009/6/24 3:51:00 Author:May
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Published:2009/6/24 3:49:00 Author:May
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Published:2009/6/24 3:49:00 Author:May
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Published:2009/6/24 3:55:00 Author:Jessie
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Published:2009/6/24 3:54:00 Author:Jessie
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Published:2009/6/24 3:53:00 Author:Jessie
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Published:2009/6/24 3:53:00 Author:Jessie
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Published:2009/6/24 3:44:00 Author:May
This preamplifier provides proper loading to a reluctance phono cartridge. It provides approximately 35 dB of galn at 1 kHz (2.2 mV input for 100 mV output).It features (S+N)/N ratio of better than -70 dB (referenced to 10 mV input at 1 kHz) and has a dynamic range of 84 dB (referenced to 1 kHz). The feedback provides for RIAA equalization. (View)
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Published:2009/6/24 3:52:00 Author:Jessie
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Published:2009/6/24 3:43:00 Author:May
Telephone bell amplifier circuit will let you hear (or see) an enhanced alarm if you are away from your telephone. (View)
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