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The 80 Meter band Radio Circuit

The 80 Meter band Radio Circuit using TR 2N2222, C460, C372, C1162, C1173, C1226, D476, D68,D67,C901 The 80 Meter band Radio Circuit using TR 2N2222, C460, C372, C1162, C1173, C1226, D476, D68, D67, C901

servo pre amp circuit using KA9257

servo pre amp circuit using KA9257 DUAL POWER OPERATIONAL AMPLIFIER The KA9257 is a monolithic integrated circuit consisting low noise amplifiers and regulated power supply for car stereos. FEATURES suitable for car stereos. Low noise amplifier. Voltage regulator included. Good ripple rejection. High channel separation (65dBTyp). Minimum number of externalparts required.

HF VHF UHF tv antenna boster Active

HF VHF UHF tv antenna boster Active circuit diagram using 2SC2570, MFE201

25W Audio Amplifier Circuit using TDA2613

25W Audio Amplifier Circuit using TDA2613

Make Wireless portable with CA3140,4069,4098

Parts: R1,R2,R19_______1K 1/4W R3-R6,R13,R17_100K 1/4W R7,R15__________1M 1/4W R8_____________50K 1/2W R9____________470R 1/4W R10___________470K 1/4W R11___________100K 1/2W R12___________220K 1/4W R14,R16________68K 1/4W R18____________22K 1/4W R20___________150R 1/4W C1,C7_________100µF 25V C2,C3_________330nF 63V C4-C6___________4µ7 25V D1,D5______Red LEDs D2,D3________1N4148 75V D4________BZX79C7V5 7.5V 500mW IC1__________CA3140 or TL061 IC2____________4069 IC3____________4098 or 4528 Q1,Q2_________BC238 25V 100mA NPN L1_____________10mH miniature Inductor BZ1___________sounder (incorporating 3KHz oscillator)

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