Simple diagrams circuits - small electronic projects

The antenna tunning circuit can accommodate 1/2 wave length antennas or higher, for input resistances of 50 Ohms which make it suitable for CB (Citizen Band) transceivers. C1 is for fine tunning and C2 is just for tunning. [...] วงจรขยายสัญญาณสายอากาศวิทยุ 27MHz หรือ CB band ใช้อุปกรณ์น้อย สามารถขยายสัญญาณวิทยุความถี่ 27Mhz ให้แรงขึ้นได้ ดูวงจร Antenna tunning circuit for 27MHz CB [...]

This circuit shows an active antenna that can be used for AM, FM, and shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. This circuit is designed to be used on receivers that use untuned wire antennas … วงจรขยายสัญญาณจากสายอากาศ รับได้หลายระบบ ทั้ง AM/FM/SW อ่านต่อ

This is an UHF band TV antenna preamplifier circuit With 15dB gain to build easily. It is formed based on BF180 UHF Transistor. The first stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a base-common voltage amplifier with low input impedance to match. [...]