Showing posts with label boost. Show all posts
Showing posts with label boost. Show all posts
Thursday, December 26, 2013
Stereo Preamplifier With Bass Boost
High Quality, simple design, DC 20v to 30v supply
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets, the bass frequency range is rather sacrificed. This circuit features also a bass-boost, in order to overcome this problem. You can use a variable resistor to set the bass-boost from 0 to a maximum of +16dB @ 30Hz. If a fixed, maximum boost value is needed, the variable resistor can be omitted and substituted by a switch.
Stereo Preamplifier With Bass Boost Circuit diagram:
P1 = 10K
P2 = 100K
R1 = 100K
R2 = 100K
R3 = 15K
R4 = 10K
R5 = 22K
R6 = 15K
R7 = 1K
R8 = 470R
C1 = 2.2uF-25v
C2 = 2.2uF-25v
C3 = 470uF-35v
C4 = 1uF-35V
C5 = 2.2uF-25v
C6 = 47nF-63v
C7 = 22uF-25v
IC1 = TL072, Opamp
SW1 = DPST Switch
Notes:
- Schematic shows left channel only, but R1, R2, R3 and C1, C2, C3 are common to both channels.
- For stereo operation P1, P2 (or SW1), R4, R5, R6, R7, R8 and C4, C5, C6, C7 must be doubled.
- Numbers in parentheses show IC1 right channel pin connections.
- A log type for P2 ensures a more linear regulation of bass-boost.
- Needing a simple boost-in boost-out operation, P2 must be omitted and SW1 added as shown in the diagram.
- For stereo operation SW1 must be a DPST type.
- Please note that, using SW1, the boost is on when the switch is open, and off when the switch is closed.
Source : http://www.ecircuitslab.com/2011/06/stereo-preamplifier-with-bass-boost.html
Wednesday, May 29, 2013
An Alternative Approach to Higher Power Boost Converters
This is a design circuit for high power boost converter circuit. This circuit is control by LM25037 Single chip IC. This circuit is a simple straightforward approach that can provide benefits over using a typical single gate-drive controller. This is the figure of the circuit;
The benefits can include higher step-up ratios and lower FET losses due to the reduction in transitional losses. Although there are a number of possible approaches to reduce total FET losses in higher-power boost converters, the equations in this article can be used to calculate total losses in the boost FETs for a number of different approaches. Considering the 150W boost converter example, it has been shown that total losses in the FETs are reduced when comparing the LM25037 dual-output gate-drive controller with the LM5020 single-output gate-drive controller.
[Schematic diagram source: National Semiconductor Notes]
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