Am Radio Otl Amplifier Tuner Receiver Experimental Electronic Circuit Board Kit

US $1200

Bangkapi, BA, Thailand
Jun 7th

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AM radio OTL amplifier Tuner Receiver experimental electronic circuit board kit DIY (with Schematic) Assembled Kit = buyer has not to put the components and soldering. Un-Assembled Kit = buyer has to put the components and soldering. A basic circuit consisting of converter, IF, and amplifier of OTL type. It is valuable device for educational purpose. Technical data - Power supply : 6VDC. - Electric current consumption : 60mA. (max.) - IC board dimension : 6.32 in x 2.38 in How does it work TR1 is part of a converter circuit. It consist of 3 sections, i.e. receiver, oscillator and mixer respectively. IF1 generate a radio frequency of 455kHz which will be amplified step by step after passing through IF2, TR3 and IF3 before entered the cathode of diode D1. The audio signal will be futher amplified after pass through VR1 and C12. TR4 is the final stage of applification. The amplified signal will be transmitted through C15 and finally to the speaker. Circuit Assembly The assembly of components is shown in Fig. 2. For good looking and easy assembly, the shorter components should be first installed - starting with low resistant components and then the higher. An important thing is that diodes, electrolyte capacitors, and transistors shall be carefully assembled before mounting them onto their right anode/cathode of the IC board otherwise it might cause damage to the components or the circuit. Configuration of the anode and the cathode is shown in Fig 3. Use the soldering iron/gun not exceeding 40 watts and the solder of tin- lead 60:40 with flux within. Recheck the correctness of installation after soldering. In case of wrong position, just use lead absorber or lead extractor wire to avoid probable damage to the IC. Testing After that connect the power supply at 6 volts into the circuit. Then the sound will be heard. Adjust the variable to the right or the left to check that how many stations it can receive. If it receive few stations, slide the rod aerial, adjust the trimmer behind the variable and OSC coil. But if the signal isn't clear, adjust IFT1 coil, IFT2 coil and IFT3 coil. Free Shipping Handling WORLDWIDE. The package will be shipped directly from Thailand via Economy/Standard Small package Airmail, and it will take about 11-23 Business Days (or about 2-5 Weeks) **Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. **Please check with your country’s customs office to determine what these additional costs will be prior to bidding / buying Return Policy 100% Satisfaction Guarantee: If you are not satisfied with the product you purchased for any reason, please contact us for a return instruction within 30 days Shipping Handling costs are not refundable. Return shipping cost will be paid by buyer. We accept ONLY PayPal for payment. Contact us Please contact us by eBay message only.