Samsung Laserdisc Player DV500K AC-3 RF circuit

Create a basic RF oscillator. The circuit is very simple, so complex calculations will be omitted, and component selection will be simplified using calculators. For this example, the target frequency is 7 MHz. The circuit includes a transistor (TR1) on...

RF oscillator uses current-feedback op amp

A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower. The configuration samples the output current, converts it to voltage across...

2 channel RF remote control

The basic small-range remote controls are Infrared and RF (Radio Frequency). One of the weaknesses of Infrared is that the signal cannot pass through walls. Therefore, to control a garage door, an RF remote control is necessary. The circuit (transmitter...

Field Strength Meter

This circuit is a wideband signal strength meter designed to respond to small variations in RF energy within the VHF spectrum. It is capable of detecting AM or FM modulation as well as a simple carrier wave. The circuit measures...

sound with coax is brighter than with optical

Adjusting the receiver settings in the Digital Audio menu revealed that the default setting was OPTICAL. After changing it to COAX, an improvement in sound quality was noticed. In digital audio systems, the choice between optical (TOSLINK) and coaxial (S/PDIF) connections...

Digital Audio Selector Circuit

This circuit employs switched emitter followers instead of conventional analog switch CMOS chips, resulting in a more effective reduction of crosstalk between channels. It can manage up to 4 Vms with less than -80 dB crosstalk. The circuit design utilizes switched...

RF Bug detector

This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no emails in regards to this circuit. If you are looking for a more serious and reliable bug detector, go to the Countersurveillance Monitor...

Stereo Channels Controller

The circuit includes better channel separation, resulting in an increased stereo effect, as well as reduced noise and hum. This schematic will allow you to cancel or blend left and right channels of your stereo. Uses the LM4136 but at...

Stereo Headphone Amplifier

Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at center...