Published:2011/8/19 2:28:00 Author:Jessie | Keyword: RC bridge oscillating, regulating ring
Connectingregulating ring to circuit, and adjusting potentiometer Rp, then you can use an oscilloscope to observe the output wave of oscillator circuit and the change of oscillating circuit's output wave, we will realize the influence of stability of regulating ring to sinusoidal oscillator circuit performance. (View)
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Published:2011/8/19 2:29:00 Author:Jessie | Keyword: High input-high output , integrated regulated power supply
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Published:2011/4/10 22:50:00 Author:may | Keyword: pin array
SA866 is special asynchronous machine SPWM control IC. It integrates kinds of protection function except generate SPWM pulse which is meeting requirements according to setup parameter. It also can fast cut off SPWM pulse in emergency, to protect frequency conversion power supply and load.
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Published:2011/4/14 6:43:00 Author:may | Keyword: Temperature monitoring, alarm equipment
The temperature monitoring alarm equipment circuit introduced in this example has high , middle , low 3 gear temperature indication. It can send out alarm signal when the temperature is too high or too low. It can use in the occasion of big-arch shelter, greenhouse, etc which is needing temperature control.
This temperature monitoring alarm equipment consists of temperature monitoring/indication circuit and voice alarm circuit. The circuit is shown in the diagram.
Theoptions of components
R1~R4 chooses 1/4W metal-film resistor or carbon film resistor.
RP chooses compound film resistor or variable resistor.
VD1~VD3 all choose 1N4148 type silicon switching diode.
VL1~VL3 all choose Φ3mm LED
V chooses S8550 or 3CG8850 type silicon PNP transistor.
IC1 chooses ZH-3 type photometry application specific integrated circuit.
HA chooses DC electric magnetic buzzer with internal alarm voice source. (View)
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Published:2011/4/14 6:52:00 Author:may | Keyword: Electronic transformer, dependable performance
The circuit can steady work to consult the circuit diagram with no changes. Output voltage is 11V-13V, output current is 6A, working frequency is 60kHz. It can change working frequency by changing the numerical value of C3, C4, R1, R2. Its no-load current is very small.
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Published:2011/4/14 6:52:00 Author:may | Keyword: Parallel push-pull, voltage changer
This circuit adopts two capacitors with 100μF to make up man-made star point. When shutting off, this circuit can prevent transistor from destroying by high back voltage. Using regulation resistance with 50Ω can adjust the turn on level of transistor. The usage of 0.1μF capacitor is toincrease thespeed of on-off.
The data of transformer:
Winding np= 160turns, 0.5mm copper lacquered wire
nr= 13turns, 0.2mm copper lacquered wire
ng= 1300turns, 0.15mm copper lacquered wire
The transistor in parallel push-pull transformer should have the ability of high withstand collector-emitter back voltage.
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Published:2011/4/14 6:50:00 Author:may | Keyword: Voltage changer, blocking oscillator
This circuit is mutual coupling by three windings of blocking oscillator transformer. This let two transistors in turns tocontrol and turn on. Each pulse can change the state of transformer, because two transistors cut off in a short time, and, later the transistor which is cutting off before is turn on because the voltage of transformer is reversing. The duration of two half-wave is the same. This time depends on the parameter of RC link. The oscillation frequency can easily adjust from 50Hz to 1kHz.
Data of transformer Tr1:
Wing n1= 100turns, 0.5mm copper enameled wire
n2= 90turns, 0.5mm copper enameled wire
n1= 150turns, 0.5mm copper enameled wire
Data of transformer Tr2:
Wing na= 25turns, 1.9mm copper enameled wire (double wrap)
nr= 20turns, 0.43mm copper enameled wire (double wrap)
na= 1160turns, 0.43mm copper enameled wire (View)
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Published:2011/4/14 6:48:00 Author:may | Keyword: Switching supply, driving transformer
The introduction of winding coiling of high frequency transformer (switching supply driving transformer)
Switching supply driving transformer EE-18
We can choose EE-18 magnetic core or the assorted skeleton of EI-18.
One can put N1 and others winding in insulating barrier,
N2, N3 double winding along with N4, N5.
N2, N3, and N4, N5 is in insulating barrier. (View)
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Published:2011/10/14 1:44:00 Author:Ecco | Keyword: Single-stage , multi-channel input, coupling resistor
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Published:2011/10/14 3:14:00 Author:Ecco | Keyword: video amplifier
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Published:2011/10/16 21:57:00 Author:Ecco | Keyword: application circuit
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Published:2011/10/16 22:26:00 Author:Ecco | Keyword: logic frame
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Published:2011/10/16 22:25:00 Author:Ecco | Keyword: application circuit
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Published:2011/10/14 1:39:00 Author:Ecco | Keyword: Low-impedance input, tube
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Published:2011/10/14 1:52:00 Author:Ecco | Keyword: Multi-channel, audio input mixing
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Published:2011/10/14 1:50:00 Author:Ecco | Keyword: Common-anode loaded inverter
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Published:2011/10/14 1:48:00 Author:Ecco | Keyword: self-bias , power amplifier , tube
The typical self-bias power amplifier stage circuit withoutdebugging of tube
The typical semi-debugself-bias power amplifier stage circuit of tube
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Published:2011/10/14 1:42:00 Author:Ecco | Keyword: shape, common potentiometer
a). b): potentiometer with switch
c): Slide potentiometer
d): asynchronous different double-axis potentiometer
e): locking-type potentiometer (View)
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Published:2011/10/14 2:03:00 Author:Ecco
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Published:2011/10/14 2:03:00 Author:Ecco | Keyword: IC
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