A flyback converter high voltage supply by 555
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The circuit diagram of the flyback converter will hold no surprises (Fig.16). Literally the only difference with the boost converter is that the inductor is replaced by a transformer, and that the transistor has been replaced for a BUZ21. The BUZ21 has a much lower on resistance (Ron=0.085 ohm) as compared to the BUZ41A (Ron=1.5 ohm) but also a lower drain-source breakdown voltage (100V versus 500V).
Read More Source:
http://www.dos4ever.com/flyback/flyback.html
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A flyback converter high voltage supply by 555
Posted by News
The circuit diagram of the flyback converter will hold no surprises (Fig.16). Literally the only difference with the boost converter is that the inductor is replaced by a transformer, and that the transistor has been replaced for a BUZ21. The BUZ21 has a much lower on resistance (Ron=0.085 ohm) as compared to the BUZ41A (Ron=1.5 ohm) but also a lower drain-source breakdown voltage (100V versus 500V).
Read More Source:
http://www.dos4ever.com/flyback/flyback.html
Thank you.
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Mini Power Amplifier 30W by TIP141 TIP146
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Many times we needed a small power amplifier, but good quality, made from distinguishable components. The design does not have any innovation. In the power stage exist a pair of transistors Darlington in package TOP3, which can screwing on a heatsink, putting between them and in the heatsink, suitable leaves mica and silicone ointment on better temperature kidnapping. The bias current regulation becomes with the TR1, as follows. We place in terminally one from resistors R20 or their R21 multimeter binding post, in scale 200mV and we regulate late the TR1 until we take clue 12mV. This voltage dip (fall) corresponds in current 30mA. We thinly leave the amplifier in this regulation for 15 min. without signal in the input and check again. If it need we correct the regulation in 30mA.
R1=1Kohm R16-17=270ohm D1=9.1V 0.4W zener
R2=47Kohm R18=22ohm 1W D2-3=1N4148
R3=1.5Kohm R19=NC Q1-2=BC550C
R4-5=10Kohm R20-21=0.39ohm 4W Q3=MPSA56
R6=5.6Kohm TR1=250ohm trimmer Q4=BC547B
R7=10ohm C1=470nF 100V MKT Q5=BC212
R8=47Kohm C2=1nF 100V MKT Q6=BC183
R9=560ohm C3=68pF ceramic Q7-8=MPSAO6
R10-11=8.2Kohm C4-8=22nF 100V MKT Q9=TIP141
R12-15=120ohm C5-6-7=100nF 100V MKT Q10=TIP146
R13=680ohm C9=47uF 25V F1-2=1.6AT FUSE
R14=330ohm C10-11=220uF 63V All the resistors is 1/4W 1% except quote differently
Read More Source:
http://users.otenet.gr/~athsam/power_amplifier_30w.htm
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56W Audio Power Amplifier with Mute by LM3876
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The LM3876 is a good quality component capable of delivering 56W continuously into an 8 ohm load and 100W peak - enough for any dorm! It has a quoted distortion figure of 0.06% at 40W output, and offers good sound quality in a simple design. It has comprehensive output protection circuitry, preventing not only thermal runaway, but protecting the device from short circuits on the output, and voltage spikes from inductive loads.
Read More Source:
http://www.headwize.com/projects/showfile.php?file=harrison2_prj.htm
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12VDC Negative Voltage DC Converter by 555
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The circuit is very simple, and is easily made on Veroboard or similar. Construction is not critical, and the schematic is shown in Figure 1 below.
Rectifier diodes should be ultrafast (UF4004 or similar), or you can use 1N4148 signal diodes. Losses will be slightly higher if you use signal diodes, or lower if you wanted to go to the trouble of using Schottky diodes - the latter are not warranted in such a simple circuit (IMO). The zener diode is to protect the circuit against transient overvoltage, and is optional
Using only a standard NE555 timer and a few other parts, this circuit should be up an running in about an hour. The 555 is configured as a minimum parts count astable (i.e. no stable states) multivibrator, and runs at around 17kHz with the values shown. The zener diode (D3) should be a 16V/ 1W type. Resistors are 1/2W carbon film, and small caps may be polyester or mylar
Read More Source:
http://sound.westhost.com/project95.htm
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