All Questions
Tagged with audio transformer
60
questions
3
votes
2
answers
374
views
How do you choose an audio isolation transformer for a microphone?
I found a few SE Q/A's for audio transformer characterization, but they neither address calculating the impedance match, nor consider signal loss for weak audio sources (like those from a microphone).
...
- 2,088
1
vote
0
answers
79
views
Can an audio isolation transformer between a preamplifier and an amplifier cause the amplifier's fuse to blow? [closed]
I'm building a microphone preamplifier. I was having problems with hum (intermittent ground hum when touching the case) and decided to try adding an audio isolation transformer (600 ohm : 600 ohm) ...
- 111
4
votes
3
answers
488
views
Why are a transformer's high and low impedance reported directly?
For context I've looked at DI boxes for audio applications. Passively operated ones use a transformer to step a source voltage down as well as provide an impedance bridge for a potentially high-...
- 143
0
votes
0
answers
110
views
Should I use transformer + op-amp or only op-amp to amplify small audio signal?
I am trying to amplify a 10uV audio signal. This is easy enough with an op-amp, except that I need to make sure Vos is much smaller than the signal. 10uV is doable, but if I want to amplify much ...
- 223
0
votes
2
answers
221
views
Power supply transformer replacement
First of all I apologize, I am not an electronics expert, just fairly good at it, but now I am faced with this weird problem that I can't figure out.
I needed to replace a transformer on a power ...
- 13
2
votes
2
answers
100
views
An old 9 V inverter circuit
I wanted to discuss and ask questions about an old inverter circuit I built 15 years ago when I was studying; the circuit was powered with an ordinary 9 V battery-Duracell type, and steps the AC ...
- 21
0
votes
0
answers
114
views
Use of an audio transformer - is this safe?
I'm new to audio things. I tried google but I couldn't find any information on basic use of audio transformer or isolation transformer.
I have a microphone that will be connected to a pre-amplifier. ...
- 499
2
votes
4
answers
420
views
Isolated transformer ground doubts
I've been designing a power supply for an audio system and for the new version I was thinking of doing that with the transformers totally isolated.
Can I connect the grounds like I drew it in the ...
- 159
0
votes
1
answer
414
views
What does the "impedance" value of audio transformers specifically mean in terms of inductance?
So I've searched the web, looked into other questions here (e.g. this one), but I am not really any wiser.
What does the impedance of a transformer specifically mean? I.e. how can I deduce the ...
- 22.5k
1
vote
1
answer
93
views
TRS balanced audio jack insertion indicator
I'm transmitting analog audio signal from BM20 bluetooth module (it has single ended audio out L + R), to amplifier TPA3118D2.
I wish to add two TRS 1/4 balanced audio output jacks (separate for L and ...
3
votes
2
answers
238
views
Running a 70V amplifier without load
I have a 70V (Pyle PMX3500PH) connected to six speakers drawing 30W each connected through an OSD volume control (SVC 300). Since it's a transformer-based volume control, when you turn it all the way ...
- 33
0
votes
0
answers
169
views
How do I clean up the static in this musical flyback transformer?
So I built this musical flyback transformer off of Franzoli Electrctronics schematic,
https://franzolielectronics.com/easy-flyback-i/.
I had to go the through hole method and it works. However, the ...
- 11
1
vote
1
answer
305
views
Questions about center-tapped transformer for tube amplifier (MC 275)
I have a question about the center-tapped AC transformer used in the attached figure and its bias voltage generation. Mainly, my question is how to generate DC supply voltage for the 12AZ7 (V4) plate (...
- 607
0
votes
3
answers
149
views
Simple transformer construction help
I’m trying to construct a small transformer to step up the audio of a crystal radio to line level. I can actually hear the radio faintly using a conventional earbud (not piezoelectric), but I’d like ...
- 235
0
votes
1
answer
647
views
Mains transformer replacement for Denon PMA-320
I am servicing a Pioneer Audio amplifier (PMA-320) which sadly has an open primary winding in the mains transformer. As you may know, original replacements are unobtainium therefore, I am planning to ...
- 863