Paul C Florian

Commercially available IR distance rangers typically handle a 3- to 30-in. detection distance. Many times, it is necessary to determine smaller distances. The circuit in Figure 1 is useful for measuring small distances to reflective surfaces. Its measurement range is...

The low-cost, three-transistor boost switching regulator in Figure 1a is a modified astable multivibrator comprising Q1, Q2, and L1, which substitutes as a load for Q2. At the full output power of 200 mW, the oscillation frequency is approximately 60 kHz. The...