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Hello all
I’m wondering whether pcb ground/return current plane should be V- or RefGND for circuits with dual-rail power supply (V+,V-, RefGND) and split power supply op-amps?
I plan to design an audio circuit and build it on two-layer pcb. It will be powered from dual rail power supply...
You can use FreeCad to merge step files. Just start new project and import step files into it one by one. Imported parts will appear in same work area. Than you can move/arrange these parts as desired and export result as another step file. For example in a picture below each PCB and two types...
I understand this. I dont understand why there is need for this diode at all? And, as i understand, after switch became opened again, diode again became reverse biased and disconnect TRIG pin from pulling up resistor, so TRIG pin voltage is always less than 1/3 of V+ (or, maybe diode acts as...
Dear all
Please help me understand this unusual(?) 555 Monostable configuration in which 555's Trigger pin and trigger pulse source
connected together via reverse biased diode. There is a lot of explanations for similar monostable configuration without diode on the web, but I can't find any...
Dear all
I was trying to hack/canibalize LCD display from an old battery charger, but I became more interested in the battery charger schematic itself.
PCB marked as GIANTOX ABS-300-03 20090427, so it should be old 2009 year design.
There is schematic i was able to transcribe (name of some...
Hello, I have a question regarding necessity of input buffer biasing because of which I used this 2.5V OpAmp Vref. from Vdc/2
(i replaced not biased input buffer with positive biased 1x gain inverting op-amp in my circuits).
I found this application report for LM358 op-amp, and in Table 2 I...
Hello
I confirm: LM741 works! I tried your setup as in Reply #24.
Also I tried LM339 instead of LM311 in my setup from reply #8, and it also works.
But LM311 still fails to produce square wave.
Now I'm believe that my LM311 chips are bad (there was some other strange behaviour with them - in...
I't looks like luck is not on my side with this project.
Thank you for guiding me through design process (including example of clear definition of project demands) amd for
explanation of inner schematic of LM311.
Now I'm understanding that main problem of this project is that I'm trying to use...
My goal for this project is to get square wave from LM311's collector output. Conditions: +5V power supply, Sin wave input from available Colpitt's oscillator.
OR, if it is impossible, my goal is to know why it is impossible. Square wave or uderstanding what was wrong, there is no practical...
+5V and GND for both pair of rails provided by breadboard power supply module that i bought together with breadboard.
Sorry, I didnt show this supply module on drawing.
Bypass 0.1uF capacitors are Polyester film type.
Thank you for bringing this aspect to my attention, i'll add to my notes
Thank you all for your time checking my circuits
Here is pictures of my circuit and breadboard layout i used, so anyone can build the same
Breadboard layout
Real bredboard
Full setup including power supply (From laptop usb) and oscilloscope
Thank you for suggestions for adding capacitor to pot and breadbord rails. Noted for future projects.
As for "pin#5 and pin#6 shorted together", I shorted them because I saw this note in Datasheet under pic 12
Actually I tried to leave pin 5 and pin 6 unconnected, but that also didn't help...
Hello All!
Taking into accout received recommendations, I modified my circuit:
- Unbiased opamp buffer has been replaced with single supply biased Av=1 inverting amplifier
(I didn't found how to correctly bias single supply simple voltage follower,
so I used single supply biased Av=1...
Hello all
I was studying how to use comparators, so decided to feed LM311P comparator with 10kHz sinusoidal waveform generated by Colpitts oscillator to confirm the comparator behaviour. But (as you've probably already guessed) LM311P didn't behave as I expected (and Colpitts oscillator as...
Hello
Thank you for clarifying! Now Im getting this output:
1) 10:1 probe (Probe 3)
- Without capacitor across output of power supply: Spike 2.67Vpp. Ripple 0.122Vpp;
- With 47nF capacitor actoss output of power supply: No spike. Ripple 0.260Vpp
2) Capacitor probe (Probe 1)
- Without...
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