Search found 319 matches

by sghioto
Thu Dec 04, 2014 4:56 pm
Forum: General Discussion
Topic: Some help with guitar active controls OpAmp circuit
Replies: 5
Views: 2981

Re: Some help with guitar active controls OpAmp circuit

I've read the article and seen the schematic. One volt input should not be a problem, in fact the maximum input is limited to the supply voltage which in this case is + and - 9 volts. The design seems to be able to handle a 1 volt input with out clipping at full boost. I suppose I would check the ba...
by sghioto
Mon Nov 24, 2014 1:47 pm
Forum: Reader Projects
Topic: 40-pulses Monoshot (200ms/1A) design_help
Replies: 1
Views: 1726

Re: 40-pulses Monoshot (200ms/1A) design_help

vinod,
Whatever happened to that monoshot circuit we worked on back in early 2013 ? Should be able to use the same design with a 24 volt power supply and a beefed up output.

Steve G
by sghioto
Sat Nov 15, 2014 5:56 am
Forum: General Discussion
Topic: Mini variable Inverter?
Replies: 20
Views: 2819

Re: Mini variable Inverter?

Try adding resistor R3 as shown, that should protect the diodes and darlington base circuit. Maybe a 1K for starters

Steve G
by sghioto
Fri Nov 14, 2014 3:50 pm
Forum: General Discussion
Topic: Mini variable Inverter?
Replies: 20
Views: 2819

Re: Mini variable Inverter?

I think going with a variac is the best option. Like this one.

http://www.automationtechnologiesinc.co ... red-variac

Steve G
by sghioto
Thu Nov 13, 2014 6:56 pm
Forum: General Discussion
Topic: Mini variable Inverter?
Replies: 20
Views: 2819

Re: Mini variable Inverter?

[quote Ignoring losses, a 3VDC source would need to supply 150W also and that amounts to 50A peak source current. with losses it may approach 60A. a 12V car battery would fare better with plenty of source current for a while with a modest 13A load.][/quote] I think the OP means he would be using the...
by sghioto
Tue Nov 11, 2014 4:06 pm
Forum: General Discussion
Topic: Propane fuel tank monitor gauge.
Replies: 6
Views: 1070

Re: Propane fuel tank monitor gauge.

From the PDF on the the unit the sensor is a ROCHESTER GAUGES R3D SENSOR. It operates from 3.5 to 6 volt DC with an analog output voltage depending on the supply voltage and tank level. Simple 3 wire device could be connected directly to a voltmeter as a wired monitor. Only needs a supply voltage. S...
by sghioto
Wed Nov 05, 2014 9:01 pm
Forum: General Discussion
Topic: color organ help...
Replies: 39
Views: 17299

Re: color organ help...

Each LED is driven by a band of frequencies, somewhere in this neighborhood if the signal is a sine wave Red: 20 to 600hz Green: 600 to 1350hz Yellow: 1350 to 3500hz Blue: 3500 to 19000hz It's normal for the LEDs to fluctuate. The way the code is written the chip is acting like a scanner. It checks ...
by sghioto
Mon Nov 03, 2014 8:09 pm
Forum: General Discussion
Topic: color organ help...
Replies: 39
Views: 17299

Re: color organ help...

dac,

Could be the audio signal is too low. Check the audio level at the Picaxe input, you need at least 1 volt rms for good response.

Steve G
by sghioto
Sun Nov 02, 2014 5:51 am
Forum: General Discussion
Topic: Electromechanical latching relay pull-in voltage
Replies: 4
Views: 936

Re: Electromechanical latching relay pull-in voltage

Found this on the web: In DC relays, after continuous passage of current in the coil, if the current is turned OFF, then immediately turned ON again, due to the temperature rise in the coil, the pick-up voltage will become somewhat higher. Also, it will be the same as using it in a higher temperatur...
by sghioto
Fri Oct 31, 2014 4:41 pm
Forum: General Discussion
Topic: wheelcair power supply
Replies: 9
Views: 1153

Re: wheelcair power supply

Check out some of those YouTube videos on rewinding the secondary of a microwave oven transformers. They claim you get about 1 volt per turn and up to 100 amps. :shock:

Steve G
by sghioto
Sun Oct 26, 2014 8:31 pm
Forum: General Discussion
Topic: Beeper chirp
Replies: 9
Views: 1455

Re: Beeper chirp

You could build one using a 555 timer chip or connect to a back-up beeper such as this one.
http://www.amazon.com/Industrial-Heavy- ... 429&sr=1-8

Steve G
by sghioto
Sat Oct 25, 2014 4:28 pm
Forum: General Discussion
Topic: Altronix 6062 Question
Replies: 9
Views: 1591

Re: Altronix 6062 Question

Question: Steve G... Why the diode in the revised drawing, the power is 12VDC?
Len,

Actually the diode is not needed. When the relay contact opens up the only path for the cap to discharge is through the timer dah. :lol:

I'll edit the schematic.

Steve G
by sghioto
Fri Oct 24, 2014 8:02 am
Forum: General Discussion
Topic: Altronix 6062 Question
Replies: 9
Views: 1591

Re: Altronix 6062 Question

Try this arrangement. Value of the cap will depend on the current draw of the 6062. Start with a 470 uf as shown and experiment with larger or smaller as needed.

Steve G
by sghioto
Mon Oct 20, 2014 3:16 pm
Forum: General Discussion
Topic: RIP Dean Huster 1949-2014
Replies: 9
Views: 1503

Re: RIP Dean Huster 1949-2014

And now there is an empty spot at the test bench. His power supply shut down for the final time. His soldering iron sits cold. Rest, oh compatriot of the electronics world. Your legacy will live on in the lives of all you have given of yourself. I know that up in the night sky, yours is not a star,...