# Tag Info

### Is it possible to use CRT tubes for audio amplification?

Technically, a CRT could be used to perform amplification as it possesses the three things you need to do so: A cathode (in the form of an electron gun), a control grid (grids, actually) and an anode. ...
• 1,662

### Amplifier with selectable inversion?

simulate this circuit – Schematic created using CircuitLab The standard configuration that I have used in the past would require two op-amp stages. The first stage is (nominally) unity gain but ...
• 22.6k
Accepted

### Amplifier with selectable inversion?

The same arrangement as shown by @Dwayne Reid can be configured to achieve the gain of two in a single stage by adding a single resistor. R3 is changed to 20k (twice R2) to change the gain in ...
• 29k

• 2,886
1 vote

### LTspice-RIAA-simulation not working out

I remember old vinyl pop-click, pop-click records. The same curve appears at https://sound-au.com/project06.htm .
• 2,149
1 vote

### How to disable Bluetooth temporarily for line in to work in mini hifi amplifier TDA7492P?

How can I disable bluetooth temporarily for line in to work? It appears that you can't. Also this amp has no line in. Googling for 'tda7492p bluetooth amplifier board manual' shows that the 3.5 mm ...
• 2,540
1 vote
Accepted

### Picking up ultrasonic signals on a hydrophone

What is the best solution to try? You should get the H2a-XLR hydrophone and run it with the Zoom U-22 interface. The Aquarian website explicitly states this is what you should be doing: on the H2a ...
• 2,363
1 vote

### Picking up ultrasonic signals on a hydrophone

The data for both products is lacking! These products are meant to be used underwater. They will perform very poorly in air due to the acoustic impedance mismatch (air to transducer). The H2a ...
• 3,745
1 vote

### How does the common emitter configuration offer higher output impedance?

Ic is a voltage-controlled(Vbe) current sink (Ic) with some Early Effect leakage resistance but otherwise high impedance output by design. An Ideal current sink is infinite but over the linear range ...
1 vote

### Where can I find large thru-hole heatsinks like this?

OPA541 can dissipate quite a lot of power, 125W according to the datasheet, and the heat sink on the picture is way too small to exploit the opamp's capabilities. In addition, the PCB itself is in the ...
• 57.4k
1 vote

### Amplifier with selectable inversion?

The "standard" solution shown in Dwayne Reid's answer is in fact a virtuoso circuit invented with an ingenious imagination. But to be convinced of this we need to see the "philosophy&...
• 9,151
1 vote

### What would the output impedance of the circuit below be?

It depends on VB. If the lower transistor is kept in saturation, then if you add additional current at RZ, the the lower device (in saturation) sinks it ==> its VGS increases by deltaI/gm. This is ...
• 12.4k
1 vote

### Non-linear amplifier

The output of amplifier, by inspection, will contain DC, 5 MHz and 10 MHz components (where 5 MHz is fundamental and 10 MHz is extra harmonic they are talking about). LPF is providing a 3 dB loss in ...
1 vote

### Common Source JFET Amplifier Gain

FOR THE IMPATIENT: Skip to Point 6, the formula. Just as with BJTs, we must account for the internal resistance of the JFET source. For the JFET, this resistance is 1/Gm (Gm in Siemens or mhos). (For ...
• 11

Only top scored, non community-wiki answers of a minimum length are eligible