Tagged Questions

1
vote
2answers
111 views

180 Phase shift for oscillator

I am currently learning how to design/build a crystal radio receiver, transmitter and have a question for the 180 degrees phase shift for the carrier amplifier/oscillator system. I commonly see this ...
1
vote
1answer
413 views

Bjt astable multivibrator questions

I'm working on a little project(an infrared jammer) and I'm having a few issues. Why (and how) exactly do circuits like the one below use electrolytic capacitors? Wouldn't ceramic capacitors be ...
6
votes
2answers
352 views

Role of capacitor in this circuit

I have troubles understanding the role of C1 capacitor in the oscillating circuit from the schematic below: My question is: what is the role of C1 in this circuit? Is it to ensure that the circuit ...
0
votes
2answers
500 views

How does this flasher circuit work?

I was watching the video on Forever Flasher circuit in Advent Calendar of Circuits 2011 series by vk2zay. Below is the circuit I am talking about. However, there are some things I understand and most ...
1
vote
1answer
1k views

Problems with Wien Bridge oscillator circuit simulation in Mutisim

I am trying to build a Wien bridge oscillator that oscillates at 2.1kHz and that can be switched on by a transistor. The reason for me placing a transistor switch in the circuit is so that I can turn ...
9
votes
4answers
456 views

Low power, low voltage, slow (0.1Hz) oscillator?

I had the opportunity to analyze a very interesting circuit today using a programmable unijunction transistor as a timer. The power supply varies, and the circuit must operate on under 10uA of ...
2
votes
2answers
397 views

Explain this circuit?

This is one of the circuits in the Electronics 9/10 class. The package did not explain how transistor combination worked and why the capacitor will reverse its current. Can you explain this ...