Showing posts with label constant. Show all posts
Showing posts with label constant. Show all posts
Wednesday, September 24, 2014
6V 12V Constant Current Battery Charger Circuit PCB Layout Added
The circuit diagram of the charger shown in Fig.1 is centered around the L200 type voltage regulator IC, which ensures constant charging voltage to any connected 6V, 12V battery.
R2 and R3 are the current limiting resistors. The charging current is selected by altering the values of R2 and R3. Strictly, the necessity of R2 holds good if the charging current exceeds 500 mA. The current required for charging is obtained by the relation: l(charging) = 0.45(R2+R3)/ R2R3
The circuit diagram and PCB layout of the above explained 6V 12V constant current battery charger is shown below:
R2 and R3 are the current limiting resistors. The charging current is selected by altering the values of R2 and R3. Strictly, the necessity of R2 holds good if the charging current exceeds 500 mA. The current required for charging is obtained by the relation: l(charging) = 0.45(R2+R3)/ R2R3
The circuit diagram and PCB layout of the above explained 6V 12V constant current battery charger is shown below:
Tuesday, August 12, 2014
Constant Bandwidth Amplifier Wiring diagram Schematic
This is a simple Constant bandwidth amplifier schema diagram. For devices such as operational amplifiers that are designed to have a simple one-pole frequency will also be equal to the unity-gain bandwidth of the amplifier the bandwidth within which the amplifier gain is at least 1. The traditional restnct1on of constant gain-bandwidth products for a voltage amplifier can be overcome by employing feedback around a current amplifier.
Constant Bandwidth Amplifier Circuit Diagram
Two current mirrors, constructed from transistors in a CA3096AE array, effectively turn the LF351 op amp into a current amplifier. Feedback is then applied by using R2 and R1, turning the whole schema into a feedback voltage amplifier with a non-inverting gain of G of 1 + R112R2. Using the values shown, a constant bandwidth of 3.5 MHz is obtained for all voltage gains up to and beyond 100 at 10 V pk-pk output, equivalent to a gain-bandwidth product of 350 MHz from an op amp with an advertised unity gain-bandwidth of 10 MHz.
An inverting gain configuration is also possible (see Fig. 2) where G ~ R1/ZR2. Slewing rates are significantly improved by this approach; even a 741 can manage 100 V p,s under these conditions since its output is a virtual earth. However, because the new configurations use current feedback to achieve bandwidth independence, an output buffer should be added for diagram where a significant output current is required.
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