In stock

SuperTeddyReg Mk2 (STR2)

$60

The SuperTeddyReg Mk2 voltage regulator, is an improved version of the world famous STR. It implements many of the circuit features that were implemented in our standard power supplies. It is offered fully assembled and tested, and is very easy to implement as a low-noise regulator for DIY purposes.

When ordering, type below input voltage, e.g. +12, and output voltage, e.g. +9. Make sure to allow at least 3V difference Vin-Vout.

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Details

 The SuperTeddyReg Mk2 voltage regulator, is an improved version of the world famous STR. It implements many of the circuit features that were implemented in our standard power supplies. It is offered only fully assembled and tested, and is very easy to implement as a low-noise regulator for DIY purposes.

Why use the STR2 Regulator?

We have done many comparisons of the STR2, vs commercial IC-based regulators, mainly from Texas Instruments and Analog Devices.
The STR2, although bigger in size due to being a discrete regulator, always shown a more consistent performance, with very low noise up to RF frequencies. It was always the better sounding as well, giving a rich presentation and well timed bass behavior.

Principle of operation

The STR2 is a fully discrete voltage regulator, which means no IC chips are included in the circuit.
The regulator block diagram is shown below:

  1. Input signal: the STR is usually located after the main smoothing capacitor in a power supply circuit, which means unregulated DC signal.
  2. Noise filter: removes a large portion of the noise residue, all the way to RF frequency harmonics.
  3. Voltage reference: created using a current source and voltage multiplier.
  4. Output stage: it is a high-gain current amplifier, aimed at isolating the voltage reference and delivering current load.

How to implement STR2

The diagram below shows a typical connection diagram of the STR2: unregulated DC voltage, after rectifier, is entered via the input terminals, regulated voltage is sent to the load circuit via the output terminals. The diagram shows positive regulator connectivity. All connections remain the same for negative regulator:

STR2 implementation - Positive

STR2 Electrical specifications

Output voltage: 3.0v -- 32v.

Connecting wires: use 20-22 AWG wires (not included) and 3-4 mm heatshrink (included) to solder the input and output terminals.

Voltage dropout: for best performance, we recommend at least 4V difference from input to output.

Current load: the STR2 is capable of handling up to 2A current load. Care must be taken when choosing proper heatsink (not included) for the power transistors.

How to calculate heat dissipation: the total power dissipation is (Vin-Vout)x(current load). The power will equally divide between the two power transistors.

STR2 Mechanical specifications

There are two ways to mount the STR2:

  1. Using the 3mm mounting holes - add spacers at least 4mm high.
  2. Using the transistors metal tab as the mounting point - make sure to add thermal isolators to prevent short-circuit.

Mounting dimensions are shown below:

 

STR2 testing before use

Before connecting the output terminals, run power to the regulator, test the output voltage and verify the LED light shines nicely.

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Weight 0.1 kg
Dimensions 3 × 4 × 2 cm

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