Books can be ordered from their publishers, after first writing for prices of the books desired. Article also tells how traffic radars work. By adding 10.5-GHz oscillator, same cir- cuit can be used in 10.5-GHz amateur radio band for communicating with other cars using this band. 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. Some foreign publica- tions, including Wireless World, shorten the abbre- viations for units of measure on diagrams. Optional connection for ±15 V supply is also shown. — «Circuit Ideas for RCA Linear ICs,» RCA Solid State Division, Somerville, NJ, 1977, p 10. HIGH-ON LOGIC CONTROL— Uses Signetics NE571 or NE570 analog compandor. Some electronics manufacturers also publish books and large reports for which charges are made.
When con- trol input is high, CR1 is off and current devel- oped by Rsain flows into rectifier input, allowing audio to be amplified. Обе эти модели уже не выпускаютсяEA-250P — усилитель на двух транзисторах, таких же, как в EA-150. Спокойно «переваривает» входную мощность до 10 ватт, выдавая при этом 170-180 ватт. Will not load circuit to which input is connected.
Diode D a clamps negative output swing of opamp to about 0.3 V, preserving amplifier recovery time in preparation for clamping next input transi- tion. Power Darlingtons are MJ4000 and MJ4010, and both opamps are 741. Preset 5K pot is adjusted initially for minimum distor- tion. Meter light uses 12 VDC or 110 VAC with MFJ-1312D. A 6-position ceramic antenna switch lets you select 2 coax lines (direct or through tuner), random wire and balanced lines. 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.