Question about Alesis Philtre Hi-Pass / band-pass /lo-pass filter with modulation Car Audio Amplifier
In semiconductors how common emitter transistor work as an oscillator?
Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!
Posted on Jan 02, 2017
Jan 08, 2014 | Nte Electronics - Others
Nov 06, 2007 | Samsung TXN3245FP 32" TV
Jan 08, 2014 | Nte D718 Equivalent NTE36 NPN high power...
Dec 22, 2013 | Sony Televison & Video
Nov 15, 2013 | Televison & Video
Jan 15, 2013 | Electronics - Others
Nov 21, 2010 | Philips 14PT1686 14" TV
Wharfedale pro bx1360sd
I have had problems with this stereo mixer amplifier which had the symptoms of no sound output from either channel .
I opened up the unit and discovered that the amplifier was correctly amplifying my input signal up to a relay which switches the output through to the speakers .
This relay did not activate at all.
When the power switch is turned ON you should hear a click approximately 2 seconds later , if no click then there is a problem with the circuitry associated with this relay .
I traced out all the connections associated with this relay and made a circuit diagram .
The relay is a 24v relay and I will explain the way that I can see that this section of the amplifier works.
It has been designed to ;
This it needed because otherwise there is a current surge and sparks from the relay turning on immediately.
Q804 turns On Q805 which turns On Q806 to activate the relay .
Voltages on transistors
Q802 and Q803 2sc1815
Base 0V Collector 12.9V Emitter 0V
Q804 2sa1015
Base 12.9V Collector 0V Emitter 15.1V
Q805 2sc1815 (driver for Q806)
Base 0V Collector 7.2V Emitter 0V
Q806 2sc1815
Base 0V at Turn ON then after 2 secs increases to 0.7V
Collector 2.8V ( transistor is activated as a switch Turned Fully ON ( saturated) to turn on the Load which is the relay .
Emitter 0V
I have replaced the following transistors to fix my amplifier q805 2sc1815 and q806 2sc1815 .If you are going to use a different type of transistor it may not work and also the lead connections of a 2sc1815 for the collector and emitter are different to those such as on a 2n2222( transposed).
Oct 15, 2010 | Audio Players & Recorders
Dec 01, 2007 | Kicker ZR600 Car Audio Amplifier
Sep 26, 2007 | Nokia 1100
115 people viewed this question
Usually answered in minutes!
×