کاربر عزیز،
به وبسایت دیــــبا خوش آمدید

با قطعات ارزان مدار میکروفون بی سیم FM قدرتمند بسازید

مدار میکروفون بی سیم FM یکی از مدارات الکترونیکی محبوب بین مبتدی‌ها و حرفه ای‌هاست. از این مدار داخل گیتار یا به عنوان بخشی از سیستم کنترل از راه دور استفاده می‌شود. در این ساختنی طرز ساخت مدار میکروفون بی سیم FM را یاد می‌گیرید که مدار قدرتمندتر و حساسیت میکروفون بیشتری دارد. این میکروفون بی سیم FM قدرتمند ثبات فرکانس بیشتری دارد – محدوده بیشتر از یک کیلومتر – و دلیلش هم استفاده از بافر آمپلی فایر RF و یک پیش تقویت کننده AF برای تقویت نوسان است.

ساخت مدار میکروفون بی سیم FM

ساخت مدار میکروفون FM بسیار ساده است. L1 گردش مارپیچ ۳٫۲۵ دارد و بخش اصلی الگوی فویلی برد مدار چاپی است. می‌توانید از دو ترانزیستور BC547 بجای هر نوع ترانزیستور NPN سیگنال کوچک مثل ۲N2222 استفاده کنید. استیج نهایی مدار هم ترانزیستور PNP همه کاره BC557 است. اگر از ترانزیستور دیگری استفاده می‌کنید، باید به کالکتور ترانزیستور اول مقاومت ۱M0 برای جریان ۵ ولت DC اضافه کنید.

گالری بالا شامل طراحی برد مدار چاپی نیز می‌باشد. ابعاد این برد ۵۰ در ۲۵ میلیمتر است و بجای یک استیج، سه استیج دارد. قدرت خروجی این مدار +۱۰dBm است که محدوده فرکانس میکروفون بی سیم را افزایش می‌دهد.

یک خازن gimmick هم به خازن تنظیم کننده ۱۲p اضافه کردیم تا فرکانس فرستند FM کمتر بشود. برای ساخت این خازن، دو تکه سیم هوک آپ تک هسته ای ۲ سانتیمتری را بهم بپیچید. به این ترتیب فرکانس به انتهای بند کاهش می‌یابد. اگر می‌خواهید فرکانس را افزایش بدهید، باید خازن را کوچکتر کنید. اگر خازن را بیش از حد کوچک یا کوتاه کردید، خازن gimmick را کمی‌بیشتر بچرخانید تا تنگ تر بشود.

با استفاده از این میکروفون بی سیم FM، گیرنده FM و فرستنده FM می‌توانید یک سیستم رادیویی FM کامل بسازید. اگر پیشنهادی برای بهبود طراحی شماتیک یا برد دارید، آن را با کاربران ساختنی به اشتراک بگذارید.

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