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Ultra Wideband Voltage Regulator +12.0V
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DX7812 12.0V UWB regulator |
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Low noise 12.0V high performance voltage regulators to replace standard 7812 regulators.
The UWB Regulators are high end replacements for 78XX regulators found in CD / DVD players and other audio equipment. For example 7805, but also other voltages are produced in UWB. (Even special ones upon request).
The output of the 7805 regulator is often used as reference for the DAC, or other noise sensitive sections of the audio equipment, like the OPAmps. Unfortunately the 7805 has relatively poor noise performance. Especially if there are external noise sources around the 7805 regulator, like ripple or load fluctuations. In case a fluctuating load is connected to the 7805, or 100 Hz ripple is present on the input of the 7805, the S/N ratio of the 7805 drops down below acceptable level for Audio purposes. In this case you can greatly benefit from a regulator with a good ripple
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rejection, but even more importantly, a regulator with a wide bandwidth loop, that can remain stable under fluctuating loads.
This simple and inexpensive upgrade gives a clear audible improvement.
The UWB regulator replaces the 7805 (or other 78XX / 79XX regulator) as a cheap and simple upgrade of your Audio Player, and has more than 100 times better ripple rejection, 10 times lower noise, and no line and load regulation error. It is discretely made on a circuit board, of roughly the same size as the 78XX / 79XX regulator. This way a regulator can be constructed with better performance than any known IC regulator on the market.
78XX is the positive voltage regulator, while .. 79XX is the negative voltage regulator. Be sure to get the right one.
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Low noise 12.0V high performance voltage regulators to replace standard 7812 regulators.
The UWB Regulators are high end replacements for 78XX regulators found in CD / DVD players and other audio equipment. For example 7805, but also other voltages are produced in UWB. (Even special ones upon request).
The output of the 7805 regulator is often used as reference for the DAC, or other noise sensitive sections of the audio equipment, like the OPAmps. Unfortunately the 7805 has relatively poor noise performance. Especially if there are external noise sources around the 7805 regulator, like ripple or load fluctuations. In case a fluctuating load is connected to the 7805, or 100 Hz ripple is present on the input of the 7805, the S/N ratio of the 7805 drops down below acceptable level for Audio purposes. In this case you can greatly benefit from a regulator with a good ripple
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rejection, but even more importantly, a regulator with a wide bandwidth loop, that can remain stable under fluctuating loads.
This simple and inexpensive upgrade gives a clear audible improvement.
The UWB regulator replaces the 7805 (or other 78XX / 79XX regulator) as a cheap and simple upgrade of your Audio Player, and has more than 100 times better ripple rejection, 10 times lower noise, and no line and load regulation error. It is discretely made on a circuit board, of roughly the same size as the 78XX / 79XX regulator. This way a regulator can be constructed with better performance than any known IC regulator on the market.
78XX is the positive voltage regulator, while .. 79XX is the negative voltage regulator. Be sure to get the right one.
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Technical Specs:
| Output Voltage: | 12.0V DC. |
| Input Voltage: | Max: 25V DC. |
| Dropout Voltage: | 2.00V (Equivalent to 78XX series). |
| Maximum Current DX78xx: | 630mA. |
| Maximum Power Dissipation * | 2.5 Watts. |
| Ripple Rejection: | >100dB. |
| Line Rejection: | unmeasurable. |
| Load Regulation: | < 5mV 0-max load. |
* Note maximum power dissipation 2.5 Watts is the current multiplied by Vin - Vout. For example if the input voltage is 10V, and the output voltage is 5V, then the drop is 10 - 5 = 5V. The drop multiplied by the current must not exceed 2.5 Watts. So in this case the max. current is 2.5 / 5 = 0.5 A or 500mA.
Perfomance.
Why should you replace the 7805? Well because of the improved performance of the UWB regulator, and the improvement in sound quality you can gain, at a relatively low cost.
The tests were
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performed with a 7805 in a typical setup with 100uF low Z on the input, and 22uF + 100nF MKT on the output (mounted directly on the TO220 package). The UWB had no capacitors at all.
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Test: Noise rejection, 12VDC + 1 Vrms 100 Hz ripple.
A lab supply was used to feed both regulators, a 100 Hz ripple signal was induced on the input via RC network. Amplitude of 1Vrms.
7805:
UWB Regulator:
Test: SMPS Noise rejection.
Typical application environment in a DVD player with a switched mode power supply. A commercial soap bar SMPS 12V 1A was used to feed both regulators, and the output looked like this:
7805:
UWB Regulator:
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As can be seen the residual output noise of the UWB regulator is several times lower. Note at higher frequencies the noise floor of the 7805 is actually lower than the UWB regulator. This is because in certain
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bands the capacitors 'eat' the noise coming out of the 7805, by clamping it to GND. Unfortunately you can never 'eat' the lower frequency bands, no matter how big capacitor you were to use.
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Test: 10kHz Sine Wave load.
A lab supply was used to feed both regulators, and the output was loaded with 10kHz 50 mA fluctuating load:
7805:
UWB Regulator:
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As you can see the UWB regulator has a much better damping of the fluctuating load of the output. This is a realistic load in a
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DAC / CD player application. The residual noise can lower the performance of the DAC, and thus the audio quality suffers.
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Test: 1kHz Square Wave Load. (Wideband Load Noise)
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A lab supply was used to feed both regulators, and the output was loaded with 1kHz 50
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mA Squarewave fluctuating load. Typical of use in digital and analog circuits:
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7805:
UWB Regulator:
Again the UWB regulator has a much better damping of the fluctuating load of the output.
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Installation.
Installation is very simple:
Remove the 78XX regulator.
Mount the UWB regulator in it's place.
If the 78XX regulator was mounted on a heat sink, you should also mount the UWB regulator on the same heat sink. If no heat sink is used in the player, you also don't have to use one with the UWB regulator.
Important! If an isolator pad is included, use it when mounting the UWB on a heat sink. Mostly the power transistor itself is isolated, so no isolator pad is necessary, and thus not supplied.
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No special considerations are necessary with regards to the input / output capacitors on the regulator. The UWB regulator does not need any capacitors neither on input nor on the output. But it will tolerate any normal size capacitor on the inputs. If the output has a large capacitor (> 47 uF) connected, it should be reduced to 47uF or less, in most cases 10nF gives the best result.
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Using an UWB regulator in a LM317 footprint
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This is a little tricky, since the UWB DX78xx is not pin compatible with LM317. However it is not impossible. First you have to make sure that your DX78xx is the same voltage as the LM317 is set to, by the local resistors. The UWB regulator will NOT take these setting resistors into account, as it has it's own setting resistors. So if the LM317 is running 5V, then use a DX7805. Connect as shown below, you will have to find a good GND connection close to the regulator
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too. The third (unused) pin of LM317 is NOT gnd, it is for the voltage setting resistors. Use a multimeter to locate GND, measure from a known GND to the points around the LM317 footprint you think could be a GND. The barrel of an RCA connector is usually a good GND reference. Remember if the LM317 is mounted on a heat sink, then the UWB regulator should also be mounted on the same heat sink. The UWB regulator is insulated, so no need to worry about insulation.
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Setting UWB to another voltage
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If you are familiar with SMD work, you can set your UWB to another voltage. The voltage setting resistor is shown below. It should be a good quality thin
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film or metal film resistor of 1% tolerance size 0805. The value should be: R = (Vout - 2,48) * 400. So for 5V use 1k, and for 15V use 5k etc.
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