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99 Threads found on edaboard.com: Audio Transformer
A capacitor across the signal would normally cause a reduction in high frequencies because of the time it would take to charge and discharge it through the 15K series resistor but I suspect it is there to resonate with the inductance of the transformer primary and cause a peak in response somewhere at the top of the audio range. The 1K resistor acr
.............. Output impedance of the audio amplifier is 4-8Ω, ..................Not true for sold-state amps. Yes they are designed to drive 4-8Ω loads, but their output impedance is a fraction of an ohm due to feedback. I agree with the recommendation to use two 220V:6V/12V transformers, and driving the
Most audio amps do not have a regulated power supply voltage. They simply use a large enough mains transformer, rectifiers and a large filter capacitor. The DC voltage normally rises a little when the amplifier plays quietly or idles then drops a little at full output power. The little voltage fluctuations are ignored by the circuit.
If you do not have the main current conductor through the centre, just apply a high frequency audio voltage to the connections. The actual inductance will have a high impedance leaving the resistor to take the current. I would do it at several spot frequencies to insure you get consistent results. Say 2KHZ, 5 KHZ, 10 KHZ. Frank
If your electricity is 120V then its peak is 170V and the full wave bridge rectifier drops it to about 168VDC. You need a transformer to isolate it so that if its ground is at 120V instead of 0V and you touch it and touch something that is grounded then the isolation prevents you from dying with a severe shock. If you make an audio amplifier wit
Hi I would like to build a small monophonic audio amplifier that will take audio from the cd player and will be able to drive a transformer, which in turn will AM modulate the anode of a small 8W transmitter. Since audio quality is not too important I wonder if a class-C amplifier is ok, or it has to be AB? I am looking (...)
You are looking for a mains transformer, not an audio transformer. I would try to find a standard transformer with two secondary windings, 15 - 17 volt, 30 - 40 watt.
well, yes, you always have some power being used by the control circuit, so eg in an offline SMPS typically its gets started up by a linear regulator, and then when up and running, some power is often derived from a bias winding on the transformer, for the purpose of powering the control circuit, but its not really like a class a audio amp which c
The transformer will be cooler. The DC will drop more at high currents. Might be audible in audio circuits. The line frequency effects the transformer and the smoothing caps.
The original circuit used an audio transformer that works perfectly at the fairly high frequency used. Your low frequency mains transformer might not work at the high frequency. The slow mains diodes also might not work at the high frequency. The simple circuit might stun a mosquito, not a person. The original 8 ohms to 1k ohms (...)
I had audio transformers made by Hammond and they interleaved the windings for excellent high frequency response. The small extra cost was worth it because cheaper ordinary transformers produced poor high frequency response.
Ohms law tells you that you need a higher power supply voltage than 14V, presuming you don't consider a bulky audio transformer. All recent car audio systems have DC/DC converters for this reason.
audio amplifiers have not used an output transformer for at least 50 years. A transformer was used to match the high output impedance of vacuum tubes to the low impedance of a speaker. A modern audio amplifier has an extremely low output impedance so it is a voltage source that drives a speaker directly. The output (...)
audio transformers undergo the same laws as mains transformers. If you understand the basic formulas how voltage, current and impedance gets transformed, you can calculate most aspects of your audio transformer. Two special points should be mentioned: - low frequency full power limit The ability of a
If you talk about matching first requirement is that audio source must have 8ohms output impedance and second is that transformer must be terminated with 1k. What is your audio source output impedance?
audio transformer insulation is not suited for very high voltage maybe a few kV . You can get far better results with a small auto ignition coil. 30kV for example. Energy out will not exceed what you put in e.g. E=1/2 L I^2 * t
Hello I have found this audio video modulator. The author states that it works ok without using an audio transformer. Can it be done or is it hoax?
Maybe your 7812 regulator IC does not have an input voltage high enough, 14VDC minimum? Then the transformer must be at least 12VAC. The output of a properly working 7812 has no hum. This amplifier circuit has an extremely high gain of 700 times so a tiny input signal will be produced at its output. Then using a shielded audio input cable is very
Hi, I have recently built an audio power amplifier with TDA2050. The project found on this web site originally uses three TDA2030 integrated amps: Circuit Power audio Amplifier with TDA2030 2.1. Following some advice in the comments, I simply rep
...Another thing is to know that iron core is more flux attractive or ferrite core? Selection of core material depends on range of signal frequency. If applied on low frequency ( mains, audio ) the best choice is iron, but above some KHz ( particularly on power switching ) ferrite becomes best suitable. +++