![]() ![]() Video formats recorded: HEVC, H.264, and ProResĭisclaimer: Mobile phone prices at Mobilemall.pk are updated according to the local mobile brands (Samsung, Huawei, Oppo, Realme, Vivo, Xiaomi, Nokia, Infinix, Tecno, etc) and mobile dealers of Pakistan. Take 8MP still photos while recording 4K video Second‑generation sensor‑shift optical image stabilization for video (Main)ĭual optical image stabilization for video (Main and Telephoto)ģx optical zoom in, 2x optical zoom out 6x optical zoom rangeĬinematic video stabilization (4K, 1080p, and 720p) ![]() Slo‑mo video support for 1080p at 120 fps or 240 fps Macro video recording, including slo-mo and time-lapse ProRes video recording up to 4K at 30 fps (1080p at 30 fps for 128GB storage) HDR video recording with Dolby Vision up to 4K at 60 fps Video 4K video recording at 24 fps, 25 fps, 30 fps, or 60 fpsġ080p HD video recording at 25 fps, 30 fps, or 60 fps.Features x optical zoom in, 2x optical zoom out 6x optical zoom range digital zoom up to 15x Sapphire crystal lens cover Adaptive True Tone flash Photonic Engine Deep Fusion Smart HDR 4 Portrait mode with advanced bokeh and Depth Control Portrait Lighting with six effects (Natural, Studio, Contour, Stage, Stage Mono, High‑Key Mono) Night mode Night mode portraits enabled by LiDAR Scanner Panorama (up to 63MP) Photographic Styles Macro photography Apple ProRAW Wide color capture for photos and Live Photos Lens correction (Ultra Wide) Advanced red‑eye correction Auto image stabilization Burst mode Photo geotagging Image formats captured: HEIF, JPEG, and DNG.12 MP, f/2.8, 77mm (telephoto), PDAF, OIS, 3x optical zoom.Quad 48 MP, (wide), dual pixel PDAF, sensor-shift OIS.Thus common op amps, such as the 741 and LM324, will likely give poorer performance in this circuit due to their high noise and distortion. The opamps shown are rail-rail types but standard types could be used if dual supply voltages are available.Īny op amp type used should have good performance (noise, bandwidth, distortion) over the audio range. ![]() Pot U2 adjusts to get the desired voltage output and compensate for the gain of the particular opto isolator you have. (A double-blind A/B listening test of music would be interesting). The simulated harmonic distortion is less than 1% at 1kHz for a 1 Vrms input, and the frequency response is 20Hz to 20kHz.ĭistortion doesn't quite meet high fidelity standards but should be inaudible in most audio applications (except perhaps to those with the proverbial "Golden Ear"). The linearity degrades at higher operating currents due to reduction in the CTR of the opto but looks good if the maximum current is kept to no more than a couple mA or so (1.6mA maximum in this simulation). The simulation results are somewhat idealized of course, as determined by the accuracy of the models, and the real linearity will depend upon the actual characteristics of the opto coupler used, but should still be good, adequate for non-critical voice and music applications. (Note the blue trace where the output is graphically superimposed over the input so any non-linearities are more readily observed). If a symmetrical output signal with respect to ground is required, then the output can be capacitively coupled to a load resistor connected to Ocom.Īs can be seen, the output voltage plot appears quite linear with respect to the input. R2 can be increased in value to increase the output voltage in this configuration, the tradeoff being some increase in the distortion. If you have a high impedance load (>1.5KΩ) and are satisfied with an output voltage of about 1/2 the input (depending upon the opto transfer gain), then U5 may not be needed and you can use the voltage across R2 as the output. Op amp U5 is a buffer/non-inverting amplifier that amplifies the voltage across R2 to convert the opto isolator output current back to a voltage. The opto is operated Class A with about 1 mA DC bias current. Op amp U3 is configured as a current driver for the opto input, generating a current proportional to the voltage input. (Ocom is the isolated output common and Rsim is just to allow the simulation to run with an isolated output ground). This eliminates the non-linear LED input voltage to current relationship, with the opto isolator output current typically being quite linear with respect to the input current, especially for low current levels.īelow is the LTspice simulation of such a circuit using the 4N25, a common and representative general purpose opto isolator. There are special purpose (and relatively expensive) optical isolators available with separate feedback connections designed for high analog linearity and fidelity but, for non-critical AC applications, a standard opto isolator may be adequate if it is driven by a current source instead of a voltage. ![]()
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