Subminiature T-3/4 RF sen- sor lamps operate in bridge circuit with R1, R2, and R3. Voltage difference between bridge legs is amplified by opamp U1. Bridge current driver Q1 supplies current for balancing bridge. Calculated error is less than 1 dB over full range of wiper. Voltage gain through compres- sor is square root of 0.7/V, N , where V IN is average input voltage.
Chopper and its control maintain high average motor current while limiting peak current by increas- ing chopping frequency from normal 125 Hz to as high as 500 Hz when high torque is re- quired.— T. Malarkey, You Need Precision SCR Chopper Control. Before attempting to start car, S, is set to ON position for ene. Motor drives switch through 2860:1 reduction gears taken from alarm clock. Other filter sections are then switched in one at a time and adjusted to give same VU reading. Location of tone con- thermal compensation. — «Circuit Ideas for RCA opamp to drive complementary-symmetry trols in feedback network improves signal-to- Linear ICs,» RCA Solid State Division, Somer- power-output transistors. Signal wires are twisted together in shield acting as ground.
Based on separation of signal envelope from constant-amplitude carrier that together make up voice signal. Sum of filter output voltages is always constant and equal to unity. Many of the books cited as sources in this volume are also sold by bookstores and by electronics supply firms. All transistors are 2N5129 or equivalent 2N5137 or 2N5220. Try different transistors until highest noise output is obtained. Effec- tiveness is most noticeable with deep bass voice, where soft peak around 1500-2000 Hz improves speech intelligibility. Meter can be from SO to 200 juA full scale if 500 mW of power is available as signal source.