Tagged Questions
0
votes
2answers
81 views
RC circuit and tone
Can I generate a tone on an 8-ohm speaker using a 5VDC power source, resistor and capacitor? For example if I want to generate a 440 Hz tone, could I use resistor capacitor values such that RC = ...
8
votes
6answers
908 views
Paper in oil (PIO) capacitors: what is special?
Many audio circuits use PIO capacitors. What are the electrical Characteristics of PIO caps that make them special (i.e. justify the cost)? Which parts of an amplifier circuit benefit most from the ...
1
vote
2answers
156 views
AC coupling with
I've the following amplifier circuit:
The two BDX77 are actually a single darlington BDX53C (I do not have the spice model for it), and the same for the two BDX78 (a single BDX54C).
It sounds ...
1
vote
1answer
87 views
Audio Capacitor Values
I'm looking to stock my capacitor drawers and I was just looking through trying to find standard values or some kind of list for them and I couldn't find a really good list of standard values for ...
2
votes
3answers
642 views
How do I make this LED flasher more sensitive?
I'm making a circuit which will change brightness level of an LED in tune with music. So far, this is producing some results, but I'm not very satisfied with it:
If it matters, the forward voltage ...
4
votes
3answers
576 views
HUGE capacitor recommended in datasheet for Audio Amp
I'm using the TPA3111 audio amplifier in a circuit of mine and I'm working on adding the appropriate capacitors. However, on page 18/19 of the datasheet TI recommends to use a 220mF capacitor on the ...
4
votes
2answers
1k views
Audio coupling capacitors
What kind of capacitors should I use to couple audio? I'm dealing with line level 1Vp-p audio, with a 1V dc offset (typ.) I want to convert this into 1Vp-p ac, at up to 20 kHz. My first version used ...
4
votes
2answers
1k views
Why is it ok to use polarized caps to remove DC offset from an audio input?
I've seen circuit diagrams that use a polarize electrolytic to remove DC offsets from an input audio signal.
The cap is polarized. Why is this ok?
