BL8530 boost power transformation of applications
http://www.siliconray.com/6n3-6p6p-6v6-hifi-wood-tube-amplifier.html
D1 for BL8530 provide a start working voltage. Can use 2 AP, IN60, 1 N5817 etc diode, R1 for DW1 voltage stabilizing diode provide a stable work current. Generally greater than 1 mA can. For example: when DW1 with TL431. Output voltage Vo = 3 + 2.5 = 5.5 V, for a different voltage stabilizing tube. But to obtain the required voltage.
To get higher than 7 V output voltage, will be in the inductance coil increases a booster winding. Circuit see FIG. 2).
Φ 0.08 mm using L2 enameled wire just in order to reduce the volume of the inductance coil. Booster winding lap according to their own needs can be around the system, according to the figure of data, use 4 V lithium battery, not answering the D3, load current in 1 mA, the output voltage more than 40 V.
Can the FIG 2 designed to shut off from the booster circuit, instead of digital multimeter a 9 V battery in, circuit is shown in figure 3. Instead of directly 9 V ?
2012年2月28日星期二
Introduce a TL431 battery chargers
Introduce a TL431 battery chargers
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The battery exceed the battery voltage, and its life expectancy will be greatly reduced.
Here introduces a simple recharging circuit, it USES the three adjustable voltage shunt type TL431 chip (IC1) as a major adjustment device. When the same phase input feet (REF) voltage less than its internal benchmark voltage (2.5 V), TL431 cathode K output high potential, make the relay keep in releasing the state, charging to continue. Conversely. When the battery voltage over the threshold voltage circuit. Make REF voltage more than 2.5 V. TL431 cathode K low potential output. Relay suck close, charging circuit disconnect, charging to stop. TL431 plus a few external components charging control circuit. Because have a reference voltage TL431 in-house. So TL431 more instruments have a lagging effect, namely the comparator ceiling and floor difference.
?
When the battery voltage up to more than the threshold voltage, relay RL1 suck close, the contacts N/C will be charging circuit disconnect, LED1 by flashing lights. At the same time, provide a lag path R3, to control the release of relay voltage Vr. Vr can work out by next type: Vr = Vref... (1 + R1 | | R3 / R2). | | R3 type of R1 for R1 and R3 of parallel value, namely (R1xR3) / (R1 + R3).
When the battery voltage is lower than release voltage, TL431 cathode (K) voltage close to the battery voltage. Relay keep in releasing the state. Charging to continue and LED1 not hair flash. Until the battery recharging voltage exceeds the threshold voltage Vt, LED1 again issued flashlight, charging to stop. R5 to limit the charging current.
http://www.siliconray.com/
The battery exceed the battery voltage, and its life expectancy will be greatly reduced.
Here introduces a simple recharging circuit, it USES the three adjustable voltage shunt type TL431 chip (IC1) as a major adjustment device. When the same phase input feet (REF) voltage less than its internal benchmark voltage (2.5 V), TL431 cathode K output high potential, make the relay keep in releasing the state, charging to continue. Conversely. When the battery voltage over the threshold voltage circuit. Make REF voltage more than 2.5 V. TL431 cathode K low potential output. Relay suck close, charging circuit disconnect, charging to stop. TL431 plus a few external components charging control circuit. Because have a reference voltage TL431 in-house. So TL431 more instruments have a lagging effect, namely the comparator ceiling and floor difference.
?
When the battery voltage up to more than the threshold voltage, relay RL1 suck close, the contacts N/C will be charging circuit disconnect, LED1 by flashing lights. At the same time, provide a lag path R3, to control the release of relay voltage Vr. Vr can work out by next type: Vr = Vref... (1 + R1 | | R3 / R2). | | R3 type of R1 for R1 and R3 of parallel value, namely (R1xR3) / (R1 + R3).
When the battery voltage is lower than release voltage, TL431 cathode (K) voltage close to the battery voltage. Relay keep in releasing the state. Charging to continue and LED1 not hair flash. Until the battery recharging voltage exceeds the threshold voltage Vt, LED1 again issued flashlight, charging to stop. R5 to limit the charging current.
2012年2月9日星期四
Switching power supply circuit diagram
Switching power supply circuit diagram
http://www.siliconray.com/sense-g5-tube-solidstate-hifi-headphone-amplifier.html
The first is that circles low-pass filter (to prevent the high frequency signal into power supply circuit), the second call rectifier bridge (alternating current into the direct current).
The third is high frequency transformers. Circuit is how it works: integrated circuits and transformers group concussion circuit, in integrated circuit 6 foot output pulse signal, for dozens of frequency to hundreds of K, 2 SK2067 is switch tube, when high electric circuit switch tube at ordinary times conduction, electricity flows through the primary transformer to switch tube (conduction) to power negative (return), when square wave low electricity at ordinary times the switch tube, transformer primary didn't current. Don't speak more below, I see it. In fact in the transformer primary added pulse voltage (exchange). Ask the high frequency transformers is that right after the chopper ? coupling ac component
http://www.siliconray.com/sense-g5-tube-solidstate-hifi-headphone-amplifier.html
The first is that circles low-pass filter (to prevent the high frequency signal into power supply circuit), the second call rectifier bridge (alternating current into the direct current).
The third is high frequency transformers. Circuit is how it works: integrated circuits and transformers group concussion circuit, in integrated circuit 6 foot output pulse signal, for dozens of frequency to hundreds of K, 2 SK2067 is switch tube, when high electric circuit switch tube at ordinary times conduction, electricity flows through the primary transformer to switch tube (conduction) to power negative (return), when square wave low electricity at ordinary times the switch tube, transformer primary didn't current. Don't speak more below, I see it. In fact in the transformer primary added pulse voltage (exchange). Ask the high frequency transformers is that right after the chopper ? coupling ac component
Switching power supply work principle
Switching power supply work principle
http://www.siliconray.com/tube-6n8p-mosfet-hybrid-hifi-audio-amplifier.html
The working process of switch power supply is fairly easy to understand, in the linear power supply, let power transistors work in the linear model, and linear power supply different is, PWM switch power supply is let power transistors work in conduction and shut off the state in which two states, add in power transistors on the v-Ann product is small (at turn-on, low voltage, current, and shut off, high voltage, current small) / power components of the product is power semiconductor current-voltage effects loss. Compared with linear power supply, PWM switch power supply work more effectively process is through "the chopper", namely the input dc voltage chop into amplitude equals input voltage amplitude of the pulse voltage to fulfill. The pulse of empty than by switching power supply to adjust the controller. once
http://www.siliconray.com/tube-6n8p-mosfet-hybrid-hifi-audio-amplifier.html
The working process of switch power supply is fairly easy to understand, in the linear power supply, let power transistors work in the linear model, and linear power supply different is, PWM switch power supply is let power transistors work in conduction and shut off the state in which two states, add in power transistors on the v-Ann product is small (at turn-on, low voltage, current, and shut off, high voltage, current small) / power components of the product is power semiconductor current-voltage effects loss. Compared with linear power supply, PWM switch power supply work more effectively process is through "the chopper", namely the input dc voltage chop into amplitude equals input voltage amplitude of the pulse voltage to fulfill. The pulse of empty than by switching power supply to adjust the controller. once
2012年2月8日星期三
Extremely high frequency amplifier self-excited how to adjust?
Extremely high frequency amplifier self-excited how to adjust?
http://www.siliconray.com/low-price-6p3p-single-ended-tube-amplifier-kit.html
Working band in the 18-31 GHZ, is a amplifier components, with two of the internal active radio frequency amplifier chip, the input power 0 dBm, output power + 30 dBm. The output signal has self-excited phenomenon, how to eliminate the phenomenon of self-excited, rf power supply voltage of the chip is not pure the influence of self-excited? Alphabetical order.
The power supply voltage instability will easy to cause the self-excited,
18-31 GHZ frequency, really tall, my experience I say little bit.
A, circuit design should be very hard, your chip power pin must use filter capacitance, your circuit before a current should not amplified, the proposal USES 220 UF and 0.1 UF capacitance parallel access, to ripple suppression effect is good. And go short circuit line as far as possible, so high frequency, must use shielding measures, preferably by shielding the circuit box up and grounded. Or as we usually radio signals, and cell phone signals, etc, all kinds of interference will be induced to circuit. Then you want to self-excited is too simple.
Second, power supply must be very stable, power supply voltage, had better use high precision oscilloscope see wave ?
http://www.siliconray.com/low-price-6p3p-single-ended-tube-amplifier-kit.html
Working band in the 18-31 GHZ, is a amplifier components, with two of the internal active radio frequency amplifier chip, the input power 0 dBm, output power + 30 dBm. The output signal has self-excited phenomenon, how to eliminate the phenomenon of self-excited, rf power supply voltage of the chip is not pure the influence of self-excited? Alphabetical order.
The power supply voltage instability will easy to cause the self-excited,
18-31 GHZ frequency, really tall, my experience I say little bit.
A, circuit design should be very hard, your chip power pin must use filter capacitance, your circuit before a current should not amplified, the proposal USES 220 UF and 0.1 UF capacitance parallel access, to ripple suppression effect is good. And go short circuit line as far as possible, so high frequency, must use shielding measures, preferably by shielding the circuit box up and grounded. Or as we usually radio signals, and cell phone signals, etc, all kinds of interference will be induced to circuit. Then you want to self-excited is too simple.
Second, power supply must be very stable, power supply voltage, had better use high precision oscilloscope see wave ?
2012年2月6日星期一
Headphone amplifiers and the sound card
Headphone amplifiers and the sound card
http://development-board.blogspot.com/
I use a SONY VPCCB26 notebook, headphones with triangle ES7, but feel the sound field headset is not enough, and even listen to nondestructive also is not very ideal, like that bring headphones can feel the whole room is filled with music feeling, and recommend a ears to put, is mainly used in the computer, hope to have the obvious improvement, is to use the good or desktop all the good, sometimes also use MP3 music, if portable points better, but still listening to a computer, you can't give consideration to the only consider a computer to use, if use computer to listen to, want to add a external sound card, ear put in 700 less than the budget, the sound card temporarily take no account of, just want to know about, key in the ear to put, if a good to add cent.
http://www.siliconray.com/sense-g5-tube-solidstate-hifi-headphone-amplifier.html
The building Lord, ES7 itself does not belong to sound field for selling headphones, and you from its parameter can see that it's actually portable gao min low resistance headphones! So put on the headset was ascension is limited, and the role of the ear is put more thrust thrust the most intuitive after more big change is not sound field but dynamic will impose. ES7 itself should be with sweet female voice style is female voice of popular portable mainly headset, quality can be, but for the sound field contrast with class vitor baia power DTX910 he sent a lot, so within 700 yuan to sound field strengthen the ear than directly into another team put headphones (sound field DTX910 is very appropriate word). For personal advice at the above consideration, little detours. After all, a 32 ohms 100 dB portable headset notes thrust completely not problems, and such as
http://development-board.blogspot.com/
I use a SONY VPCCB26 notebook, headphones with triangle ES7, but feel the sound field headset is not enough, and even listen to nondestructive also is not very ideal, like that bring headphones can feel the whole room is filled with music feeling, and recommend a ears to put, is mainly used in the computer, hope to have the obvious improvement, is to use the good or desktop all the good, sometimes also use MP3 music, if portable points better, but still listening to a computer, you can't give consideration to the only consider a computer to use, if use computer to listen to, want to add a external sound card, ear put in 700 less than the budget, the sound card temporarily take no account of, just want to know about, key in the ear to put, if a good to add cent.
http://www.siliconray.com/sense-g5-tube-solidstate-hifi-headphone-amplifier.html
The building Lord, ES7 itself does not belong to sound field for selling headphones, and you from its parameter can see that it's actually portable gao min low resistance headphones! So put on the headset was ascension is limited, and the role of the ear is put more thrust thrust the most intuitive after more big change is not sound field but dynamic will impose. ES7 itself should be with sweet female voice style is female voice of popular portable mainly headset, quality can be, but for the sound field contrast with class vitor baia power DTX910 he sent a lot, so within 700 yuan to sound field strengthen the ear than directly into another team put headphones (sound field DTX910 is very appropriate word). For personal advice at the above consideration, little detours. After all, a 32 ohms 100 dB portable headset notes thrust completely not problems, and such as
How to see headphones to don't use headphone amplifiers
How to see headphones to don't use headphone amplifiers
http://www.siliconray.com/
First look at the impedance, generally greater than 32 ohms headset need amplifier. Listen to voice, if impedance is low but the sound is the problem of high frequency wool or harsh, show your audio output is insufficient, need to add amplifier
How to see headphones to don't use headphone amplifiers
http://www.siliconray.com/
First look at the impedance, generally greater than 32 ohms headset need amplifier. Listen to voice, if impedance is low but the sound is the problem of high frequency wool or harsh, show your audio output is insufficient, need to add amplifier
How to see headphones to don't use headphone amplifiers
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