Circuits & Schematics: Design - 4

31. Temperature compensated lead acid battery float charger
    Dave Conrad
    Circuits Supply Analog Devices LT1086
    .. effects. This can lead to loss of water and production of hydrogen gas, which can cause explosions or fires. Figure 1. The design provides constant charge current and temperature compensated float voltage with a small number of common ...
    Aug 5, 2024

32. Single supply 200kHz VFC with bipolar differential inputs
    Stephen Woodward
    Circuits Analogue Design Measurement Microchip LM4040
    .. VFC conversion times are defiantly difficult, but at least millisecond rates are definitely doable as shown in this design idea. Nearly four decades ago (in his Designs for High Performance Voltage-to-Frequency Converters), famed ...
    Jul 24, 2024

33. Voltage inverter design idea transmogrifies into a 1MHz VFC
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    It’s interesting, useful, and fun that basic electronic topologies often turn out to have utility in multiple and surprisingly different applications. Figure 1 shows an example of such a circuit. It’s a charge pump voltage inverter ...
    Jul 18, 2024
34. Precision programmable current source uses two ICs
    Pietro Oliva Stefano Salvatori
    Circuits Analogue Design Supply Analog Devices LT1991 LT1995 LT1996
    .. Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current ...
    Jul 17, 2024
35. Monitor a differential pair for valid & fault conditions
    Budge Ing
    Circuits Interfaces Analog Devices MAX3280E
    .. is advantageous to know if there is a valid signal on a differential signal bus. This Design Idea detects differential data transmission and reports a loss of signal (LOS) to a microcontroller or other ...
    Jul 11, 2024
36. Solar day-lamp with active MPPT and no ballast resistors
    Stephen Woodward
    Circuits Supply Solar Texas Instruments CD4053B LM340L LMC555 TLV9101
    .. panel and still be bright enough to be useful, puts a premium on achieving high efficiency for both conversion steps. This design idea (see the Figure 1) presents some ways to achieve these design imperatives. Figure 1. Solar day lamp with ...
    Jul 2, 2024
37. RC-timed shutoff function uses op amp and momentary switch
    Glen Chenier
    Circuits Measurement Supply Texas Instruments LMC6482
    .. before cutting and splicing, thus avoiding accidental outages. With no room on the front panel for a power switch, the design requires a sliding clamp mechanism to turn the unit on at its extreme travel position when an operator ...
    Jul 2, 2024
38. Ultra-low distortion oscillator. Part 1 - How not to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    .. the years, the Design Ideas (DI) column has featured many interesting oscillators, but none that I can recall was specifically ...
    Jun 26, 2024
39. Analog comparator recognizes three signal relations
    Glen Chenier
    Circuits Analogue Design Measurement Intersil ICL7650S
    .. when the photodiodes respond with signal levels closer together. The desired thresholds are dependent on the mechanical design of the optical clamp which is beyond the scope of this DI. If no signals are present in either direction, ...
    Jun 20, 2024
40. "Brick-wall" lowpass audio filter needs no tuning
    Diego Puyal Pilar Molina
    Circuits Analogue Design Audio STMicroelectronics LF347
    .. a lowpass filter with a steep frequency-cutoff characteristic, an engineer can opt for a “brick-wall”- filter design that features a sharp transition band. For example, in an FM stereophonic-broadcast system, the lowpass ...
    Jun 17, 2024

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