Published:2011/4/2 4:24:00 Author:Nicole | Keyword: Tube amplifier power supply
As shown , after the power through switch and inductor, then through T1 transformer, through rectifier filter then supply power to he filament and TDA2822, T2 is connected to the T1 secondary, producing high voltage, the rectifier filter and regulator supply high voltage to 6N3. The signal outputed after amplified by 6N3, then through TDA2822 drive headphone. In this paper, the circuit is simple, without any debugging, the component parameters have been indicated in the schematic, the select of components can refer to other articles, to use some components with better performance. This machine is particularly quiet in the static, sound is very good.
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Published:2011/4/10 22:33:00 Author:Ecco | Keyword: Polyphonic , sound imitation , generator
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Published:2011/4/12 0:38:00 Author:Ecco | Keyword: Noise generator
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Published:2011/4/10 22:42:00 Author:Ecco | Keyword: Wien-bridge , sine wave generator
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Published:2011/4/10 22:43:00 Author:Ecco | Keyword: Wien-bridge , sine wave generator
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Published:2011/4/1 4:03:00 Author:Nicole | Keyword: electron tube
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Published:2011/4/1 4:03:00 Author:Nicole | Keyword: electron tube
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Published:2011/4/10 22:45:00 Author:Ecco | Keyword: Wien-bridge, sine wave generator
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Published:2011/4/1 4:02:00 Author:Nicole | Keyword: Amp, electron
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Published:2011/4/1 4:02:00 Author:Nicole | Keyword: amp
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Published:2011/4/6 4:10:00 Author:Nicole | Keyword: DC voltage, bidirectional out-of-limit
This alarm circuit will issue a directive when the power voltage is higher or lower a range, to remind us to adopt necessary measures. In this circuit, W2, W3 determines the starting value of upper and lower limit alarm. Circuit adjustment can be done by using a regulator.
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Published:2011/4/12 4:13:00 Author:Nicole | Keyword: detector
Using any fire, smoke, heat or other detectors and connecting to the primary relaxation oscillator, using GE-X5 thyristor to push 8Ω loudspeaker emits keke . Loudspeaker, 22.5V battery, 100kΩ and on/off switch are in series with the both ends of thyristor; connected a 1μF/25V capacitor to the both ends of thyristor-loudspeaker. Such as using cadmium sulfide photocell can detect the flashlight light beam of interloper. (View)
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Published:2011/4/6 4:11:00 Author:Nicole | Keyword: electric welding machine, energy-saving
As shown in the figure, T1 is AC electric welding machine transformer. The power switch HK turns on, power transformer T2 obtains the electricity first, filter capacitor C1 obtains about 12V AC voltage. IC1, IC2 is two 555 time base IC. Because the voltage of initial state C2 is 0, the ②、⑥ pins of IC1 is low level, so ③ pin is high level, relay K is not pull-in, AC contactor KM is not work, electric welding machine is no energizing. At the same time, the multivibrator composed of IC2 starts working, the output frequency of ③ pin is about 10kHz pulse singal. After through R5, the later singal is added to one end of T1 secondary, the other end is connected to the grouding of control circuit, duing to T1 secondary winding has large inductance about 10kHz singal, so the current of this loop is lower, the voltage of transformer L is lower too. the other singal is coupled to C4, after VDR、VD9 rectifiers, C5 filter, the DC voltage turns VT1 on, VT2 off. So C2 is without charge current, IC1③ pin keeps high level. The circuit is in no-load energy-saving state.
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Published:2011/4/12 2:54:00 Author:Ecco | Keyword: Multi-purpose , FM signal generator
The multi-purpose FM signal generator is shown in the chart. VTl, VT2 form multivibrator, VT3 is emitter follower, which makes a frequency modulation to osicillating signal source of VT4, and sent by Tx antenna.
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Published:2011/4/10 22:48:00 Author:Ecco | Keyword: Pulse , width modulation
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Published:2011/4/10 22:49:00 Author:Ecco | Keyword: Linear , pulse width modulation
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Published:2011/4/12 3:37:00 Author:Ecco | Keyword: Frequency shift keying, signal generator
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Published:2011/4/12 3:38:00 Author:Ecco | Keyword: Sine wave generator , 555
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Published:2011/4/12 3:33:00 Author:Ecco | Keyword: 60Hz, frequency source
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Published:2011/4/6 4:11:00 Author:Nicole | Keyword: laser transmitter, linearity control
Used optical feedback technique can keep constant laser output in a wide temperature range. This circuit is a optical negative feedback circuit which is insensitive to temperature.
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