Search found 6 matches

by Karl Fischer
Mon Jun 04, 2018 7:48 pm
Forum: Getting Started
Topic: Short circuit through ground
Replies: 3
Views: 1294

Re: Short circuit through ground

Thanks Gerry,

The variac is off the table. For the DC power supply I will stick to series of 12 volt batteries. A little less variable but no connection to the mains.
by Karl Fischer
Fri Jun 01, 2018 9:05 pm
Forum: Getting Started
Topic: Short circuit through ground
Replies: 3
Views: 1294

Short circuit through ground

I want to use a variac with a rectifier bridge and capacitor as a variable DC source. Because a variac is not shielded from the mains I see a possible problem. Is it safe to connect my 2205A (x100 probe) to this source or do I risk creating a short circuit through the ground via the PC?
by Karl Fischer
Thu Jun 22, 2017 8:15 pm
Forum: Projects
Topic: Amplify AWG signal
Replies: 11
Views: 5759

Re: Amplify AWG signal

After some online research I found that I need a MOSFET+driver but the circuitry is still unclear. I might skip de AWG and use an Arduino + two MOSFET driver modules. I will have to write the code for the waveforms but it's a lot cheaper than amplifying the AWG: flcelectronics.com/a600.html ($5.000+)
by Karl Fischer
Sun Jun 11, 2017 6:32 pm
Forum: Projects
Topic: Amplify AWG signal
Replies: 11
Views: 5759

Re: Amplify AWG signal

Yes, only for square waves: -on off +on. (Voltage set by DC-PSU) Let's keep it as simple as possible.
by Karl Fischer
Sat Jun 10, 2017 1:26 pm
Forum: Projects
Topic: Amplify AWG signal
Replies: 11
Views: 5759

Re: Amplify AWG signal

Thank you bennog for your reply. I tried your suggestion with a standard audio amplifier to see how it would perform. It did not do well. Even at low frequencies (<1kHz) the square waves lose their sharp edges and become distorted sine waves. Tube amplifiers might be more suitable but the cost and t...
by Karl Fischer
Wed Jun 07, 2017 7:53 pm
Forum: Projects
Topic: Amplify AWG signal
Replies: 11
Views: 5759

Amplify AWG signal

I recently bought the 2205A scope. It works fine but I bumped into a limitation of the AWG. The output voltage range is ±2V. For my application i need a square wave of a least ±50V. Can you recommend additional hardware or suggest electronic circuits how to amplify the square signal from the AWG?