Showing posts with label single. Show all posts
Showing posts with label single. Show all posts

Thursday, October 23, 2014

TDA7000 Single Chip FM Radio

This fm radio series fm radio receiver circuit that uses a single ic TDA.


Quite easy to make this fm radio circuit, where all functions can be done by IC TDA, so we only add to the technical components only. External components are intended to support so you can determine its own range of frequencies to be used. Actually if you want to have the radio equipment are satisfactory you can buy a radio market. Now this type of radio is very varied and the prices varying as well. To be sure with the money of 30 thousand you can get the fm radio with satisfactory quality. Because now the most sold radio is using digital functions, unlike the more dominant is the first transistor radio. But if you are a hobby with experimental electronics, not the rupiah value but which you consider the value of their knowledge.

For the working principle of this circuit does not really exist that must be addressed because all the functions already performed by the internal circuit is ic TDA. That if we do a surgical series is in the ic, the result will not be much different circuits fm radio receiver in general.

Component List:
1. IC TDA 7000
2. Resistor: 100 Kohm, 22 Kohm 100 Kohm and potensio
3. Capacitors: 39 pF, 37 pF, 220 nF, 22 nF, 10 nF, 180 pF, 150 pF, 100 nF, 330 pF, 220 pF, 3.3 nF, 330 pF, 3.3 pF, 220 nF, 1.8 nF, 1.8 nF, 25-50 pF
4. Inductors: 56 NH (2 pieces)
5. Loudspeaker
6. Antenna
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Friday, September 26, 2014

Active Tone Control Circuit Using a Single Opamp

The input signal is applied to the non-inverting input of the lC which is a Siemens TAA861 operational amplifier.
Bass and treble boost and cut are con_trolled by the potentiometers RV1 and RV2 respectively. Control range is 20 dB of boost or cut at 50 Hz and 15 dB boost or 20 dB of cut at 12 kHz. The overall gain of the circuit at 1 kHz is 15dB and the input impedance is greater than 80 k ohm. Total harmonic distortion for 2.4 volts output is less than 0.5% and remains below 4% for up to 3.5 volts output. Correct law for the potentiometer is antilog. This may be obtained by using slide potentiometers which are mounted in reverse (end-for~end) to normal. Note that equalization is not incorporated in this preamplifier.



This simple single-transistor circuit will give approximately 15 dB boost or cut at 100 Hz and 15 kHz respectively. A low noise audio type transistor is used, and the output can be fed directly into any existing amplifier volume control to which the tone control is to be fitted. A The gain of the circuit is near unity when controls are set in the "flat" position. 


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Friday, September 19, 2014

LTM4620 – Dual 13A or Single 26A DC DC µModule Regulator with Integrated Heatsink

The LTM4620 is a dual 13A per output (or single 26A output) DC/DC μModule step-down regulator that delivers up to 100A when four devices are current shared. The LTM4620 is a complete DC/DC regulator system in a 15mm x 15mm x 4.41mm LGA package, including inductors, power stages and all control circuits. For optimum heat dissipation, an integrated top side heat sink removes heat quickly and evenly.[Link]

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