Showing posts with label single. Show all posts
Showing posts with label single. Show all posts
Saturday, September 6, 2014
Single vs Multiple Drivers
There are advantages and disadvantages to either approach. For this, lets consider a scenario where the cone area of a single driver is equal to the cumulative cone area of multiple drivers: An example of this would be a single 10" woofer with an Sd of 50in^2 versus a pair of 8" woofers with an Sd of 25in^2 each.
The single driver advantage: Linearity. A single driver system isnt subject to the acoustic or electrical forces countering in phase--even if by a fraction of a degree--which typically occurs when multiple pistons share a common space or when multiple inductors share a common circuit.
The single driver disadvantage: It has been my observation that a single larger driver will typically exhibit higher equivalent air compliance (Vas) than the combined compliance of two smaller drivers. This can translate into higher Vb requirements.
The multiple driver advantage: Assuming that the motor structure is the same on both the 8" and the 10" model, the immediate advantage is twice the motor for every square inch of cone area, twice the power handling, and more end-impedance versatility.
The multiple driver disadvantage: As stated above, using multiple independently actuated pistons increases the risk of the electro-mechanical forces countering one another. This is particularly evident with high Qts drivers.
Read More..
The single driver advantage: Linearity. A single driver system isnt subject to the acoustic or electrical forces countering in phase--even if by a fraction of a degree--which typically occurs when multiple pistons share a common space or when multiple inductors share a common circuit.
The single driver disadvantage: It has been my observation that a single larger driver will typically exhibit higher equivalent air compliance (Vas) than the combined compliance of two smaller drivers. This can translate into higher Vb requirements.
The multiple driver advantage: Assuming that the motor structure is the same on both the 8" and the 10" model, the immediate advantage is twice the motor for every square inch of cone area, twice the power handling, and more end-impedance versatility.
The multiple driver disadvantage: As stated above, using multiple independently actuated pistons increases the risk of the electro-mechanical forces countering one another. This is particularly evident with high Qts drivers.
Friday, August 15, 2014
Single transistor radio
Here is the schema diagram of a simple radio that uses one transistor and few other passive components.The C6 and L1 forms a tank schema which picks up the signal from your desired radio station.Diode D1, capacitor C2 and resistor R1 does the detection of the picked signal.The detected signal is coupled to the base of Q1 through capacitor C3.The Q1 gives required amplification to the signal.The resistor R2 is used to bias Q1.R3 limits the collector current of Q1.The audio output will be available at the collector of Q1 and it can be heard by using a high impedance head phone.This radio will work only at places where there is reasonable radio signal strength.
Notes.
* Assemble the schema on a general purpose PCB.
* The schema can be powered from a 3V battery.
* The antenna can be a 1 M long wire.
* The headphone must be a high impedance(2 to 3K) type.
* If diode AA121 is not available you can use AA112, AA116 or 1N34.
* The inductor L1 must be a 0.35mH, center tapped one.
* The radio can be tuned by adjusting the variable capacitor C6.
Subscribe to:
Posts (Atom)
