Luc Lemmens (178)

| Undesired listening-in to telephone conversations may be prevented by the present circuit, which requires only two components to protect...

| In a traditional differential amplifier with feedback to the -ve (inverting) input of an operational amplifier and a potential divider at...

| It is sometimes necessary to make a telephone conversation audible to more than one person at either end or to make a tape recording of i...

| When the disk drive indicator of a computer cannot be read (since the computer is under or beside the table) it may be useful. If difficu...

| Although lhe properties of the LM317 regulator are excellent, they can be improved by cascading two of these devices. There is then a co...

| Integrated voltage regulators LM317 and LM337 enable a simple, regulated, symmetrical power supply as shown in the diagram to be designed....

| A 600 Hz signal at a level of 2.4 Vpp generated by the oscillator on board an LM1830 (NationalSemiconductor) is applied to a probe via C2....

| The 2-metre band has been popular tor three decades and Ionger tor short, medium-range and mobile communication between radio amateurs,...