CW reciever with Tubes

This is a circuit diagram of a portable AM radio receiver utilizing the ZN414 integrated circuit (IC), which has been replaced by the MK484, offering identical performance and pin configuration. The receiver is designed to operate within the medium...

The performance of this sensitive ultrasonic receiver is impressive. It allows users to listen to various sources of ultrasonic sounds, including insects, bats, engines, and more. The circuit employs a piezo tweeter as an ultrasonic microphone, along with amplifier...

One of the circuits used in projects is the MC13135/MC13136. It is the second generation of single-chip, dual-conversion FM communication receivers developed by Motorola. Major improvements in signal handling, RSSI, and first oscillator operation have been made. At pin...

The 786A multi-functional double-tube fluorescent emergency circuit is illustrated in Figure 2-129. This circuit shares similarities with Figure 2-125. The 786A multi-functional double-tube fluorescent emergency circuit is designed to provide illumination during power outages or emergencies. It utilizes two fluorescent...

MOC3020M Integrated Circuit. An LED indicator is desired to signal when each capacitor is charged, but the implementation details are unclear. There is an abundance of 5V LEDs available, which could be utilized. Although Circuit Maker is available for...

The quartz QZ1 of the preceding receivers which set the work frequency is not on the market any more. It is replaced by a locking phase loop allowing the free choice of an unspecified frequency on the band used,...