[3V DC to 5V DC @ 1000mA converter.]

;D

I want to build this power supply for my iPod to be used when travelling. I have seen the design using LT1308 and MC34063... the problem is that these ICs are not available in my country.

do you guys have other designs?

Thanks.

[TDA1524A Tone Control IC]

Hi, Audioguru!

I wired the Tone control as per data sheet specification.

I am using a Piezo Type Stereo tuner as my test input.

[TDA1524A Tone Control IC]

I built a project, a tone control for the 22W TDA1554 Power Amp. It is now working. But my problem is I can seem to make it sound loud unless I turn the vol to the max. And it starts to sound only whent the volume control is turned more than a quarter turn.

Now, there is no problem with the sound. An I read somewhere that this fault is inherent when using a linear pot and that I should use a logarithmic pot. I can't find such pot here in the Philippines. Is there a work around this problem?

Thanks.

[Inverter Circuit 12V DC to 230VAC Sine Wave]

Thanks Audioguru... yes, I have my Xformer customized and it is 12-0-12 50A primary and 220 volts secondary.

Then your fans and 60Hz transformer will be overloaded with a load more than about 400W. It is easy to fix. Change the 47k resistor at the CD4047 oscillator to 39k.

Did you use a 12V-0-12V 50A transformer? It should be 600VA.

[Automatic Electronics Dry Box]

I wonder how these devices able to control humidity inside an enclosure and how can they mimic the funcion of silica gels.

Anybody have a circuit of this?

[Inverter Circuit 12V DC to 230VAC Sine Wave]

My bad. Very bad! I did your version Audioguru... but my Frequency is 50Hz when the AC freq in the Philippines is 60Hz.

I will try to redi it again.

Hi Wild Swan,
Our original 500W inverter had errors so it didn't work. I helped correct the errors two and a half years ago. My corrected circuit recently was deleted from the project. Which circuit did you make?

What happens to its output when it is loaded with more than only 50W?
Do you have a fully charged car battery powering it through very heavy wires?
Maybe its frequency is wrong.

[Inverter Circuit 12V DC to 230VAC Sine Wave]

I built the original and never returned here again. I was busy trying to figure out why do the Inverter keeps on burning Electric Fans.

Tha fan I used was the common type, one with the 0, 1, 2, 3 mechanical control, not electronics like a light dimmer.

Now that I am out of aces, I returned here and surprised that the circuit has evolved. :D

Now which circuit will not damage electric fans? I managed to destroy some numbers of electric fans over the years. :D

I tend to beleive Ante... maybe the inverter are not for Inductive Loads. :(

[Inverter Circuit 12V DC to 230VAC Sine Wave]

Okay.. I built the 500w Power Inverter... it's working but why does it burn my electic fan's motor after running sometimes?

All I can do with it now is to light a 50W Incandescent Bulb. :(