Description:
Elementary questions about electronics.
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Building Your Own Flyback Transformer
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A friend gave me a little yellow toroid (ferrite?) with a winding around it, that he had butchered from some non-working computer part. I unwound the (thick!) wire, re-wound it with 10 turns of primary, and 50 turns of secondary. I then built an astable multivibrator switching at 70 kHz, running off... more »
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Compact Fluorescent Lamp
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When you turn the CFL on, It will take about 40 sec brighten fully , which make it very inconvenient to use. Can any members help me to explain this phenomenon ? Thank You. Regards
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Do Sock Puppets Count As Readership?
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If you get a lot of responses under different handles, all with nothing to say, is it any better than having zero readership of people with somethig to say? Bret Cahill
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Constructing a "delay" into a system?
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OK I can solder, and 50 years ago took an RCA Electronics course so I could fix b&w TV's. Since then, not too much electronical has happened around me! I now fly some lightweight, foam Radio Controlled airplanes Every now and then, due to "operator error"... I put one down in a cornfield or some other... more »
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Scope dilema
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I am looking to purchase my first oscilloscope use from eBay. I have seen many recommendations for the Tektronix 465 series of analog scopes. I have also seen several 100 Mhz Tektronix digital storage oscilloscopes such as the 2232 and 2236 for prices in my range. My interests are mostly in microcontrollers, but will be using some... more »
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PIC16F88 swaping bit status in PORTB
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Hello every one! I have a microcontroler PIC16F88. I want to make some simple applications with it, but for some applications I need to swap the value of one bit in one of two ports (PORTA or PORTB). For example: If PORTB bit 3 is set I want to reset it. And if PORTB bit 3 is reset I want to set it.... more »
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help reading a datasheet
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Hi, I am looking at digikey web site the IRFZ44 TO-220AB, there are many chips available. I am a bit confuse concerning the resistance Vs Watt coloumn. I Will take two randomly the IRFZ44VZ-ND WITH 12mOhm Rds and 92W power @31 amps 10v and the IRFZ44R-ND WITH 28mOhm Rds and 150W power @31 amps 10v... more »
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