Software Update For Up Controlled Frequency Meter

2 Channel A 00- Channel B Ss IC2 6116 2 DI 02 ‚Äò4.5 5v 0 CL 211 IR RIR 0 13 O ¬ß14¬ß1.4 1. IC3 7411a1393 Po2F1I05RS2R sTS 6-41 co, 741101174 4.- R92R518951 IMMO,c) reamer ¬?,1,14".4 tc5 75m7593 3x 154148 C1 1C1 3140 alm e giD‚Ä¢ ‚Ä¢ FF1 - 3 CLIC 119 S D FF2 11 CU( CO C 0 0 CD" if Icl 5V ICS Ica Ic10 IC9 FF1, FF2 = IC? = 7414CT74 N1_144 =108 = 7491C7132 145-N8 = IC9 = 20.7132 IC 10 = 7444C7390 Fr‚Ä¢ 3.91 MInftcom C2 9,01.471 92s.(FREE44) xD CS gr 1 OM Fig. 2 Circuit diagram of the complete 2-channel unit. The modifications are shown in bold lines, the extension in the shaded area. applied to input B may not go negative. Figures la and lb illustrate the effect ob- tained with the modified and extended VLF storage unit. Finally, some constructors have reported the absence of count pulses on pin 7 of ICIo on selecting display range b (12.5 s). This effect is probably due to parasitic capacitance blocking the decimal counter, and may be remedied by fitting a 33 kQ series resistor on...