FM transmitter Repair

Started by amdx in sci.electronics.basics3 months ago 10 replies

HI guys, I have attempted a repair on an FM transmitter. I replaced TR2,(shorted) VR1,(10.7 V output, VR1 is a SMD L78L09), and R4, it...

HI guys, I have attempted a repair on an FM transmitter. I replaced TR2,(shorted) VR1,(10.7 V output, VR1 is a SMD L78L09), and R4, it looked overheated, measured OK. I fired it up and then found the output Mosfet (F1)shorted and VR1 with an output of 11.2V. So I replaced the Mosfet and the L78L09. The unit works, output is good. However, the 9 volt regulator again has 11.2 v o...


OT: Test, Ignore

Started by Bill Bowden in sci.electronics.basics4 months ago 17 replies

Test

Test


Cell phone electrocution

Started by Anonymous in sci.electronics.basics4 months ago 40 replies

Apparently she reached for her phone while she was in the bath, and it was charging... but still......

Apparently she reached for her phone while she was in the bath, and it was charging... but still... ?! http://www.foxnews.com/tech/2017/07/11/teen-dies-from-using-cellphone-while-taking-bath.html


Power factor for rectifier/capacitor input

Started by bob prohaska in sci.electronics.basics4 months ago 7 replies

Power supplies that take AC line power, rectify it to DC and then use a DC-DC converter to generate whatever output is desired seem fairly...

Power supplies that take AC line power, rectify it to DC and then use a DC-DC converter to generate whatever output is desired seem fairly common. Those that I've dissected don't seem to have any inductors between the caps and the AC line. What's the power factor in such a setup? It's clearly not zero, because some power gets to the load, but all the AC line sees is a pure reactance, unles...


Pop up displays | Pop up Stand | | Dot2Dot

Started by Anonymous in sci.electronics.basics4 months ago

A pop up system is normally a little window that suddenly shows up in the forefront of the visual interface. Pop up system are a stylish...

A pop up system is normally a little window that suddenly shows up in the forefront of the visual interface. Pop up system are a stylish exhibition solution for anyone looking for an eye-catching curved back walls .High quality pop ups stands to create an impact at any type of events. It is incredible for exhibition, showrooms, and occasions, gathering zones, award ceremonies and pr


Honda Battery Charging

Started by Jim Thompson in sci.electronics.basics4 months ago

Looks like Honda finally started 'charging' their batteries... {> :-} ...Jim...

Looks like Honda finally started 'charging' their batteries... {> :-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-S


Digital printing in Malaysia | Pop up Stand | | Dot2Dot

Started by Anonymous in sci.electronics.basics4 months ago

Are you looking for a pop up display to boost the look of your trade show booth .Pop up Displays also have the convenience of being portable,...

Are you looking for a pop up display to boost the look of your trade show booth .Pop up Displays also have the convenience of being portable, simple to store and an easy display stand system to line up. Pop up displays include gorgeous graphics and case-to-counter choices. Most Pop Up Displays can be set up by one person during a matter of minutes. Taking a Pop Up stand down after


MOSFET: N- or P-, enhance or deplete?

Started by Bob Engelhardt in sci.electronics.basics4 months ago 35 replies

Here's really basic question for s.e.BASICS: I want to use a MOSFET to control a load, via a switch. The tricky part is that I need load...

Here's really basic question for s.e.BASICS: I want to use a MOSFET to control a load, via a switch. The tricky part is that I need load current when the switch is open and no current when the switch is closed. What I am confused about is what type of MOSFET to use, and its orientation in the circuit (S & D connected which way?) + | ...


OT: Test, Ignore

Started by billbowden in sci.electronics.basics4 months ago

Test

Test


ground wire

Started by kurtstocklmeir in sci.electronics.basics5 months ago 45 replies

I have a big mess. A person took off my carburetor on my car and I can not find the person. The carburetor was put back on my car but there is...

I have a big mess. A person took off my carburetor on my car and I can not find the person. The carburetor was put back on my car but there is 1 wire from the fuel cut off solenoid that is not connected to the car. The solenoid is part of the carburetor. I can not find any person who knows where the wire goes. I think - the wire is black - it connects to ground or negative. If I can not find...


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